// MediaWiki JavaScript support functions

var clientPC = navigator.userAgent.toLowerCase(); // Get client info
var is_gecko = ((clientPC.indexOf('gecko')!=-1) && (clientPC.indexOf('spoofer')==-1)
                && (clientPC.indexOf('khtml') == -1) && (clientPC.indexOf('netscape/7.0')==-1));
var is_safari = ((clientPC.indexOf('applewebkit')!=-1) && (clientPC.indexOf('spoofer')==-1));
var is_khtml = (navigator.vendor == 'KDE' || ( document.childNodes && !document.all && !navigator.taintEnabled ));
// For accesskeys
var is_ff2_win = (clientPC.indexOf('firefox/2')!=-1 || clientPC.indexOf('minefield/3')!=-1) && clientPC.indexOf('windows')!=-1;
var is_ff2_x11 = (clientPC.indexOf('firefox/2')!=-1 || clientPC.indexOf('minefield/3')!=-1) && clientPC.indexOf('x11')!=-1;
if (clientPC.indexOf('opera') != -1) {
	var is_opera = true;
	var is_opera_preseven = (window.opera && !document.childNodes);
	var is_opera_seven = (window.opera && document.childNodes);
	var is_opera_95 = (clientPC.search(/opera\/(9.[5-9]|[1-9][0-9])/)!=-1);
}

// Global external objects used by this script.
/*extern ta, stylepath, skin */

// add any onload functions in this hook (please don't hard-code any events in the xhtml source)
var doneOnloadHook;

if (!window.onloadFuncts) {
	var onloadFuncts = [];
}

function addOnloadHook(hookFunct) {
	// Allows add-on scripts to add onload functions
	onloadFuncts[onloadFuncts.length] = hookFunct;
}

function hookEvent(hookName, hookFunct) {
	if (window.addEventListener) {
		window.addEventListener(hookName, hookFunct, false);
	} else if (window.attachEvent) {
		window.attachEvent("on" + hookName, hookFunct);
	}
}

// document.write special stylesheet links
if (typeof stylepath != 'undefined' && typeof skin != 'undefined') {
	if (is_opera_preseven) {
		document.write('<link rel="stylesheet" type="text/css" href="'+stylepath+'/'+skin+'/Opera6Fixes.css">');
	} else if (is_opera_seven && !is_opera_95) {
		document.write('<link rel="stylesheet" type="text/css" href="'+stylepath+'/'+skin+'/Opera7Fixes.css">');
	} else if (is_opera_95) {
		document.write('<link rel="stylesheet" type="text/css" href="'+stylepath+'/'+skin+'/Opera95Fixes.css">');
	} else if (is_khtml) {
		document.write('<link rel="stylesheet" type="text/css" href="'+stylepath+'/'+skin+'/KHTMLFixes.css">');
	}
}

if (wgBreakFrames) {
	// Un-trap us from framesets
	if (window.top != window) {
		window.top.location = window.location;
	}
}

// for enhanced RecentChanges
function toggleVisibility(_levelId, _otherId, _linkId) {
	var thisLevel = document.getElementById(_levelId);
	var otherLevel = document.getElementById(_otherId);
	var linkLevel = document.getElementById(_linkId);
	if (thisLevel.style.display == 'none') {
		thisLevel.style.display = 'block';
		otherLevel.style.display = 'none';
		linkLevel.style.display = 'inline';
	} else {
		thisLevel.style.display = 'none';
		otherLevel.style.display = 'inline';
		linkLevel.style.display = 'none';
	}
}

function historyRadios(parent) {
	var inputs = parent.getElementsByTagName('input');
	var radios = [];
	for (var i = 0; i < inputs.length; i++) {
		if (inputs[i].name == "diff" || inputs[i].name == "oldid") {
			radios[radios.length] = inputs[i];
		}
	}
	return radios;
}

// check selection and tweak visibility/class onclick
function diffcheck() {
	var dli = false; // the li where the diff radio is checked
	var oli = false; // the li where the oldid radio is checked
	var hf = document.getElementById('pagehistory');
	if (!hf) {
		return true;
	}
	var lis = hf.getElementsByTagName('li');
	for (var i=0;i<lis.length;i++) {
		var inputs = historyRadios(lis[i]);
		if (inputs[1] && inputs[0]) {
			if (inputs[1].checked || inputs[0].checked) { // this row has a checked radio button
				if (inputs[1].checked && inputs[0].checked && inputs[0].value == inputs[1].value) {
					return false;
				}
				if (oli) { // it's the second checked radio
					if (inputs[1].checked) {
						oli.className = "selected";
						return false;
					}
				} else if (inputs[0].checked) {
					return false;
				}
				if (inputs[0].checked) {
					dli = lis[i];
				}
				if (!oli) {
					inputs[0].style.visibility = 'hidden';
				}
				if (dli) {
					inputs[1].style.visibility = 'hidden';
				}
				lis[i].className = "selected";
				oli = lis[i];
			}  else { // no radio is checked in this row
				if (!oli) {
					inputs[0].style.visibility = 'hidden';
				} else {
					inputs[0].style.visibility = 'visible';
				}
				if (dli) {
					inputs[1].style.visibility = 'hidden';
				} else {
					inputs[1].style.visibility = 'visible';
				}
				lis[i].className = "";
			}
		}
	}
	return true;
}

// page history stuff
// attach event handlers to the input elements on history page
function histrowinit() {
	var hf = document.getElementById('pagehistory');
	if (!hf) {
		return;
	}
	var lis = hf.getElementsByTagName('li');
	for (var i = 0; i < lis.length; i++) {
		var inputs = historyRadios(lis[i]);
		if (inputs[0] && inputs[1]) {
			inputs[0].onclick = diffcheck;
			inputs[1].onclick = diffcheck;
		}
	}
	diffcheck();
}

// generate toc from prefs form, fold sections
// XXX: needs testing on IE/Mac and safari
// more comments to follow
function tabbedprefs() {
	var prefform = document.getElementById('preferences');
	if (!prefform || !document.createElement) {
		return;
	}
	if (prefform.nodeName.toLowerCase() == 'a') {
		return; // Occasional IE problem
	}
	prefform.className = prefform.className + 'jsprefs';
	var sections = [];
	var children = prefform.childNodes;
	var seci = 0;
	for (var i = 0; i < children.length; i++) {
		if (children[i].nodeName.toLowerCase() == 'fieldset') {
			children[i].id = 'prefsection-' + seci;
			children[i].className = 'prefsection';
			if (is_opera || is_khtml) {
				children[i].className = 'prefsection operaprefsection';
			}
			var legends = children[i].getElementsByTagName('legend');
			sections[seci] = {};
			legends[0].className = 'mainLegend';
			if (legends[0] && legends[0].firstChild.nodeValue) {
				sections[seci].text = legends[0].firstChild.nodeValue;
			} else {
				sections[seci].text = '# ' + seci;
			}
			sections[seci].secid = children[i].id;
			seci++;
			if (sections.length != 1) {
				children[i].style.display = 'none';
			} else {
				var selectedid = children[i].id;
			}
		}
	}
	var toc = document.createElement('ul');
	toc.id = 'preftoc';
	toc.selectedid = selectedid;
	for (i = 0; i < sections.length; i++) {
		var li = document.createElement('li');
		if (i === 0) {
			li.className = 'selected';
		}
		var a = document.createElement('a');
		a.href = '#' + sections[i].secid;
		a.onmousedown = a.onclick = uncoversection;
		a.appendChild(document.createTextNode(sections[i].text));
		a.secid = sections[i].secid;
		li.appendChild(a);
		toc.appendChild(li);
	}
	prefform.parentNode.insertBefore(toc, prefform.parentNode.childNodes[0]);
	document.getElementById('prefsubmit').id = 'prefcontrol';
}

function uncoversection() {
	var oldsecid = this.parentNode.parentNode.selectedid;
	var newsec = document.getElementById(this.secid);
	if (oldsecid != this.secid) {
		var ul = document.getElementById('preftoc');
		document.getElementById(oldsecid).style.display = 'none';
		newsec.style.display = 'block';
		ul.selectedid = this.secid;
		var lis = ul.getElementsByTagName('li');
		for (var i = 0; i< lis.length; i++) {
			lis[i].className = '';
		}
		this.parentNode.className = 'selected';
	}
	return false;
}

// Timezone stuff
// tz in format [+-]HHMM
function checkTimezone(tz, msg) {
	var localclock = new Date();
	// returns negative offset from GMT in minutes
	var tzRaw = localclock.getTimezoneOffset();
	var tzHour = Math.floor( Math.abs(tzRaw) / 60);
	var tzMin = Math.abs(tzRaw) % 60;
	var tzString = ((tzRaw >= 0) ? "-" : "+") + ((tzHour < 10) ? "0" : "") + tzHour + ((tzMin < 10) ? "0" : "") + tzMin;
	if (tz != tzString) {
		var junk = msg.split('$1');
		document.write(junk[0] + "UTC" + tzString + junk[1]);
	}
}

function unhidetzbutton() {
	var tzb = document.getElementById('guesstimezonebutton');
	if (tzb) {
		tzb.style.display = 'inline';
	}
}

// in [-]HH:MM format...
// won't yet work with non-even tzs
function fetchTimezone() {
	// FIXME: work around Safari bug
	var localclock = new Date();
	// returns negative offset from GMT in minutes
	var tzRaw = localclock.getTimezoneOffset();
	var tzHour = Math.floor( Math.abs(tzRaw) / 60);
	var tzMin = Math.abs(tzRaw) % 60;
	var tzString = ((tzRaw >= 0) ? "-" : "") + ((tzHour < 10) ? "0" : "") + tzHour +
		":" + ((tzMin < 10) ? "0" : "") + tzMin;
	return tzString;
}

function guessTimezone(box) {
	document.getElementsByName("wpHourDiff")[0].value = fetchTimezone();
}

function showTocToggle() {
	if (document.createTextNode) {
		// Uses DOM calls to avoid document.write + XHTML issues

		var linkHolder = document.getElementById('toctitle');
		if (!linkHolder) {
			return;
		}

		var outerSpan = document.createElement('span');
		outerSpan.className = 'toctoggle';

		var toggleLink = document.createElement('a');
		toggleLink.id = 'togglelink';
		toggleLink.className = 'internal';
		toggleLink.href = 'javascript:toggleToc()';
		toggleLink.appendChild(document.createTextNode(tocHideText));

		outerSpan.appendChild(document.createTextNode('['));
		outerSpan.appendChild(toggleLink);
		outerSpan.appendChild(document.createTextNode(']'));

		linkHolder.appendChild(document.createTextNode(' '));
		linkHolder.appendChild(outerSpan);

		var cookiePos = document.cookie.indexOf("hidetoc=");
		if (cookiePos > -1 && document.cookie.charAt(cookiePos + 8) == 1) {
			toggleToc();
		}
	}
}

function changeText(el, newText) {
	// Safari work around
	if (el.innerText) {
		el.innerText = newText;
	} else if (el.firstChild && el.firstChild.nodeValue) {
		el.firstChild.nodeValue = newText;
	}
}

function toggleToc() {
	var toc = document.getElementById('toc').getElementsByTagName('ul')[0];
	var toggleLink = document.getElementById('togglelink');

	if (toc && toggleLink && toc.style.display == 'none') {
		changeText(toggleLink, tocHideText);
		toc.style.display = 'block';
		document.cookie = "hidetoc=0";
	} else {
		changeText(toggleLink, tocShowText);
		toc.style.display = 'none';
		document.cookie = "hidetoc=1";
	}
}

var mwEditButtons = [];
var mwCustomEditButtons = []; // eg to add in MediaWiki:Common.js

// this function generates the actual toolbar buttons with localized text
// we use it to avoid creating the toolbar where javascript is not enabled
function addButton(imageFile, speedTip, tagOpen, tagClose, sampleText, imageId) {
	// Don't generate buttons for browsers which don't fully
	// support it.
	mwEditButtons[mwEditButtons.length] =
		{"imageId": imageId,
		 "imageFile": imageFile,
		 "speedTip": speedTip,
		 "tagOpen": tagOpen,
		 "tagClose": tagClose,
		 "sampleText": sampleText};
}

// this function generates the actual toolbar buttons with localized text
// we use it to avoid creating the toolbar where javascript is not enabled
function mwInsertEditButton(parent, item) {
	var image = document.createElement("img");
	image.width = 23;
	image.height = 22;
	image.className = "mw-toolbar-editbutton";
	if (item.imageId) image.id = item.imageId;
	image.src = item.imageFile;
	image.border = 0;
	image.alt = item.speedTip;
	image.title = item.speedTip;
	image.style.cursor = "pointer";
	image.onclick = function() {
		insertTags(item.tagOpen, item.tagClose, item.sampleText);
		return false;
	};

	parent.appendChild(image);
	return true;
}

function mwSetupToolbar() {
	var toolbar = document.getElementById('toolbar');
	if (!toolbar) { return false; }

	var textbox = document.getElementById('wpTextbox1');
	if (!textbox) { return false; }

	// Don't generate buttons for browsers which don't fully
	// support it.
	if (!(document.selection && document.selection.createRange)
		&& textbox.selectionStart === null) {
		return false;
	}

	for (var i = 0; i < mwEditButtons.length; i++) {
		mwInsertEditButton(toolbar, mwEditButtons[i]);
	}
	for (var i = 0; i < mwCustomEditButtons.length; i++) {
		mwInsertEditButton(toolbar, mwCustomEditButtons[i]);
	}
	return true;
}

function escapeQuotes(text) {
	var re = new RegExp("'","g");
	text = text.replace(re,"\\'");
	re = new RegExp("\\n","g");
	text = text.replace(re,"\\n");
	return escapeQuotesHTML(text);
}

function escapeQuotesHTML(text) {
	var re = new RegExp('&',"g");
	text = text.replace(re,"&amp;");
	re = new RegExp('"',"g");
	text = text.replace(re,"&quot;");
	re = new RegExp('<',"g");
	text = text.replace(re,"&lt;");
	re = new RegExp('>',"g");
	text = text.replace(re,"&gt;");
	return text;
}

// apply tagOpen/tagClose to selection in textarea,
// use sampleText instead of selection if there is none
function insertTags(tagOpen, tagClose, sampleText) {
	var txtarea;
	if (document.editform) {
		txtarea = document.editform.wpTextbox1;
	} else {
		// some alternate form? take the first one we can find
		var areas = document.getElementsByTagName('textarea');
		txtarea = areas[0];
	}
	var selText, isSample = false;

	if (document.selection  && document.selection.createRange) { // IE/Opera

		//save window scroll position
		if (document.documentElement && document.documentElement.scrollTop)
			var winScroll = document.documentElement.scrollTop
		else if (document.body)
			var winScroll = document.body.scrollTop;
		//get current selection  
		txtarea.focus();
		var range = document.selection.createRange();
		selText = range.text;
		//insert tags
		checkSelectedText();
		range.text = tagOpen + selText + tagClose;
		//mark sample text as selected
		if (isSample && range.moveStart) {
			if (window.opera)
				tagClose = tagClose.replace(/\n/g,'');
			range.moveStart('character', - tagClose.length - selText.length); 
			range.moveEnd('character', - tagClose.length); 
		}
		range.select();   
		//restore window scroll position
		if (document.documentElement && document.documentElement.scrollTop)
			document.documentElement.scrollTop = winScroll
		else if (document.body)
			document.body.scrollTop = winScroll;

	} else if (txtarea.selectionStart || txtarea.selectionStart == '0') { // Mozilla

		//save textarea scroll position
		var textScroll = txtarea.scrollTop;
		//get current selection
		txtarea.focus();
		var startPos = txtarea.selectionStart;
		var endPos = txtarea.selectionEnd;
		selText = txtarea.value.substring(startPos, endPos);
		//insert tags
		checkSelectedText();
		txtarea.value = txtarea.value.substring(0, startPos)
			+ tagOpen + selText + tagClose
			+ txtarea.value.substring(endPos, txtarea.value.length);
		//set new selection
		if (isSample) {
			txtarea.selectionStart = startPos + tagOpen.length;
			txtarea.selectionEnd = startPos + tagOpen.length + selText.length;
		} else {
			txtarea.selectionStart = startPos + tagOpen.length + selText.length + tagClose.length;
			txtarea.selectionEnd = txtarea.selectionStart;
		}
		//restore textarea scroll position
		txtarea.scrollTop = textScroll;
	} 

	function checkSelectedText(){
		if (!selText) {
			selText = sampleText;
			isSample = true;
		} else if (selText.charAt(selText.length - 1) == ' ') { //exclude ending space char
			selText = selText.substring(0, selText.length - 1);
			tagClose += ' '
		} 
	}

}


/**
 * Set the accesskey prefix based on browser detection.
 */
var tooltipAccessKeyPrefix = 'alt-';
if (is_opera) {
	tooltipAccessKeyPrefix = 'shift-esc-';
} else if (is_safari
	   || navigator.userAgent.toLowerCase().indexOf('mac') != -1
	   || navigator.userAgent.toLowerCase().indexOf('konqueror') != -1 ) {
	tooltipAccessKeyPrefix = 'ctrl-';
} else if (is_ff2_x11 || is_ff2_win) {
	tooltipAccessKeyPrefix = 'alt-shift-';
}
var tooltipAccessKeyRegexp = /\[(ctrl-)?(alt-)?(shift-)?(esc-)?.\]$/;

/**
 * Add the appropriate prefix to the accesskey shown in the tooltip.
 * If the nodeList parameter is given, only those nodes are updated;
 * otherwise, all the nodes that will probably have accesskeys by
 * default are updated.
 *
 * @param Array nodeList -- list of elements to update
 */
function updateTooltipAccessKeys( nodeList ) {
	if ( !nodeList ) {
		// skins without a "column-one" element don't seem to have links with accesskeys either
		var columnOne = document.getElementById("column-one");
		if ( columnOne )
			updateTooltipAccessKeys( columnOne.getElementsByTagName("a") );
		// these are rare enough that no such optimization is needed
		updateTooltipAccessKeys( document.getElementsByTagName("input") );
		updateTooltipAccessKeys( document.getElementsByTagName("label") );
		return;
	}

	for ( var i = 0; i < nodeList.length; i++ ) {
		var element = nodeList[i];
		var tip = element.getAttribute("title");
		var key = element.getAttribute("accesskey");
		if ( key && tooltipAccessKeyRegexp.exec(tip) ) {
			tip = tip.replace(tooltipAccessKeyRegexp,
					  "["+tooltipAccessKeyPrefix+key+"]");
			element.setAttribute("title", tip );
		}
	}
}

/**
 * Add a link to one of the portlet menus on the page, including:
 *
 * p-cactions: Content actions (shown as tabs above the main content in Monobook)
 * p-personal: Personal tools (shown at the top right of the page in Monobook)
 * p-navigation: Navigation
 * p-tb: Toolbox
 *
 * This function exists for the convenience of custom JS authors.  All
 * but the first three parameters are optional, though providing at
 * least an id and a tooltip is recommended.
 *
 * By default the new link will be added to the end of the list.  To
 * add the link before a given existing item, pass the DOM node of
 * that item (easily obtained with document.getElementById()) as the
 * nextnode parameter; to add the link _after_ an existing item, pass
 * the node's nextSibling instead.
 *
 * @param String portlet -- id of the target portlet ("p-cactions", "p-personal", "p-navigation" or "p-tb")
 * @param String href -- link URL
 * @param String text -- link text (will be automatically lowercased by CSS for p-cactions in Monobook)
 * @param String id -- id of the new item, should be unique and preferably have the appropriate prefix ("ca-", "pt-", "n-" or "t-")
 * @param String tooltip -- text to show when hovering over the link, without accesskey suffix
 * @param String accesskey -- accesskey to activate this link (one character, try to avoid conflicts)
 * @param Node nextnode -- the DOM node before which the new item should be added, should be another item in the same list
 *
 * @return Node -- the DOM node of the new item (an LI element) or null
 */
function addPortletLink(portlet, href, text, id, tooltip, accesskey, nextnode) {
	var node = document.getElementById(portlet);
	if ( !node ) return null;
	node = node.getElementsByTagName( "ul" )[0];
	if ( !node ) return null;

	var link = document.createElement( "a" );
	link.appendChild( document.createTextNode( text ) );
	link.href = href;

	var item = document.createElement( "li" );
	item.appendChild( link );
	if ( id ) item.id = id;

	if ( accesskey ) {
		link.setAttribute( "accesskey", accesskey );
		tooltip += " ["+accesskey+"]";
	}
	if ( tooltip ) {
		link.setAttribute( "title", tooltip );
	}
	if ( accesskey && tooltip ) {
		updateTooltipAccessKeys( new Array( link ) );
	}

	if ( nextnode && nextnode.parentNode == node )
		node.insertBefore( item, nextnode );
	else
		node.appendChild( item );  // IE compatibility (?)

	return item;
}


/**
 * Set up accesskeys/tooltips from the deprecated ta array.  If doId
 * is specified, only set up for that id.  Note that this function is
 * deprecated and will not be supported indefinitely -- use
 * updateTooltipAccessKey() instead.
 *
 * @param mixed doId string or null
 */
function akeytt( doId ) {
	// A lot of user scripts (and some of the code below) break if
	// ta isn't defined, so we make sure it is.  Explictly using
	// window.ta avoids a "ta is not defined" error.
	if (!window.ta) window.ta = new Array;

	// Make a local, possibly restricted, copy to avoid clobbering
	// the original.
	var ta;
	if ( doId ) {
		ta = [doId];
	} else {
		ta = window.ta;
	}

	// Now deal with evil deprecated ta
	var watchCheckboxExists = document.getElementById( 'wpWatchthis' ) ? true : false;
	for (var id in ta) {
		var n = document.getElementById(id);
		if (n) {
			var a = null;
			var ak = '';
			// Are we putting accesskey in it
			if (ta[id][0].length > 0) {
				// Is this object a object? If not assume it's the next child.

				if (n.nodeName.toLowerCase() == "a") {
					a = n;
				} else {
					a = n.childNodes[0];
				}
			 	// Don't add an accesskey for the watch tab if the watch
			 	// checkbox is also available.
				if (a && ((id != 'ca-watch' && id != 'ca-unwatch') || !watchCheckboxExists)) {
					a.accessKey = ta[id][0];
					ak = ' ['+tooltipAccessKeyPrefix+ta[id][0]+']';
				}
			} else {
				// We don't care what type the object is when assigning tooltip
				a = n;
				ak = '';
			}

			if (a) {
				a.title = ta[id][1]+ak;
			}
		}
	}
}

function setupRightClickEdit() {
	if (document.getElementsByTagName) {
		var spans = document.getElementsByTagName('span');
		for (var i = 0; i < spans.length; i++) {
			var el = spans[i];
			if(el.className == 'editsection') {
				addRightClickEditHandler(el);
			}
		}
	}
}

function addRightClickEditHandler(el) {
	for (var i = 0; i < el.childNodes.length; i++) {
		var link = el.childNodes[i];
		if (link.nodeType == 1 && link.nodeName.toLowerCase() == 'a') {
			var editHref = link.getAttribute('href');
			// find the enclosing (parent) header
			var prev = el.parentNode;
			if (prev && prev.nodeType == 1 &&
			prev.nodeName.match(/^[Hh][1-6]$/)) {
				prev.oncontextmenu = function(e) {
					if (!e) { e = window.event; }
					// e is now the event in all browsers
					var targ;
					if (e.target) { targ = e.target; }
					else if (e.srcElement) { targ = e.srcElement; }
					if (targ.nodeType == 3) { // defeat Safari bug
						targ = targ.parentNode;
					}
					// targ is now the target element

					// We don't want to deprive the noble reader of a context menu
					// for the section edit link, do we?  (Might want to extend this
					// to all <a>'s?)
					if (targ.nodeName.toLowerCase() != 'a'
					|| targ.parentNode.className != 'editsection') {
						document.location = editHref;
						return false;
					}
					return true;
				};
			}
		}
	}
}

var checkboxes;
var lastCheckbox;

function setupCheckboxShiftClick() {
	checkboxes = [];
	lastCheckbox = null;
	var inputs = document.getElementsByTagName('input');
	addCheckboxClickHandlers(inputs);
}

function addCheckboxClickHandlers(inputs, start) {
	if ( !start) start = 0;

	var finish = start + 250;
	if ( finish > inputs.length )
		finish = inputs.length;

	for ( var i = start; i < finish; i++ ) {
		var cb = inputs[i];
		if ( !cb.type || cb.type.toLowerCase() != 'checkbox' )
			continue;
		var end = checkboxes.length;
		checkboxes[end] = cb;
		cb.index = end;
		cb.onclick = checkboxClickHandler;
	}

	if ( finish < inputs.length ) {
		setTimeout( function () {
			addCheckboxClickHandlers(inputs, finish);
		}, 200 );
	}
}

function checkboxClickHandler(e) {
	if (typeof e == 'undefined') {
		e = window.event;
	}
	if ( !e.shiftKey || lastCheckbox === null ) {
		lastCheckbox = this.index;
		return true;
	}
	var endState = this.checked;
	var start, finish;
	if ( this.index < lastCheckbox ) {
		start = this.index + 1;
		finish = lastCheckbox;
	} else {
		start = lastCheckbox;
		finish = this.index - 1;
	}
	for (var i = start; i <= finish; ++i ) {
		checkboxes[i].checked = endState;
	}
	lastCheckbox = this.index;
	return true;
}

function toggle_element_activation(ida,idb) {
	if (!document.getElementById) {
		return;
	}
	document.getElementById(ida).disabled=true;
	document.getElementById(idb).disabled=false;
}

function toggle_element_check(ida,idb) {
	if (!document.getElementById) {
		return;
	}
	document.getElementById(ida).checked=true;
	document.getElementById(idb).checked=false;
}

/**
 * Restore the edit box scroll state following a preview operation,
 * and set up a form submission handler to remember this state
 */
function scrollEditBox() {
	var editBox = document.getElementById( 'wpTextbox1' );
	var scrollTop = document.getElementById( 'wpScrolltop' );
	var editForm = document.getElementById( 'editform' );
	if( editBox && scrollTop ) {
		if( scrollTop.value )
			editBox.scrollTop = scrollTop.value;
		addHandler( editForm, 'submit', function() {
			document.getElementById( 'wpScrolltop' ).value = document.getElementById( 'wpTextbox1' ).scrollTop; 
		} );
	}
}
hookEvent( 'load', scrollEditBox );

var allmessages_nodelist = false;
var allmessages_modified = false;
var allmessages_timeout = false;
var allmessages_running = false;

function allmessagesmodified() {
	allmessages_modified = !allmessages_modified;
	allmessagesfilter();
}

function allmessagesfilter() {
	if ( allmessages_timeout )
		window.clearTimeout( allmessages_timeout );

	if ( !allmessages_running )
		allmessages_timeout = window.setTimeout( 'allmessagesfilter_do();', 500 );
}

function allmessagesfilter_do() {
	if ( !allmessages_nodelist )
		return;

	var text = document.getElementById('allmessagesinput').value;
	var nodef = allmessages_modified;

	allmessages_running = true;

	for ( var name in allmessages_nodelist ) {
		var nodes = allmessages_nodelist[name];
		var display = ( name.indexOf( text ) == -1 ? 'none' : '' );

		for ( var i = 0; i < nodes.length; i++)
			nodes[i].style.display =
				( nodes[i].className == "def" && nodef
				  ? 'none' : display );
	}

	if ( text != document.getElementById('allmessagesinput').value ||
	     nodef != allmessages_modified )
		allmessagesfilter_do();  // repeat

	allmessages_running = false;
}

function allmessagesfilter_init() {
	if ( allmessages_nodelist )
		return;

	var nodelist = new Array();
	var templist = new Array();

	var table = document.getElementById('allmessagestable');
	if ( !table ) return;

	var rows = document.getElementsByTagName('tr');
	for ( var i = 0; i < rows.length; i++ ) {
		var id = rows[i].getAttribute('id')
		if ( id && id.substring(0,16) != 'sp-allmessages-r' ) continue;
		templist[ id ] = rows[i];
	}

	var spans = table.getElementsByTagName('span');
	for ( var i = 0; i < spans.length; i++ ) {
		var id = spans[i].getAttribute('id')
		if ( id && id.substring(0,17) != 'sp-allmessages-i-' ) continue;
		if ( !spans[i].firstChild || spans[i].firstChild.nodeType != 3 ) continue;

		var nodes = new Array();
		var row1 = templist[ id.replace('i', 'r1') ];
		var row2 = templist[ id.replace('i', 'r2') ];

		if ( row1 ) nodes[nodes.length] = row1;
		if ( row2 ) nodes[nodes.length] = row2;
		nodelist[ spans[i].firstChild.nodeValue ] = nodes;
	}

	var k = document.getElementById('allmessagesfilter');
	if (k) { k.style.display = ''; }

	allmessages_nodelist = nodelist;
}

hookEvent( "load", allmessagesfilter_init );

/*
	Written by Jonathan Snook, http://www.snook.ca/jonathan
	Add-ons by Robert Nyman, http://www.robertnyman.com
	Author says "The credit comment is all it takes, no license. Go crazy with it!:-)"
	From http://www.robertnyman.com/2005/11/07/the-ultimate-getelementsbyclassname/
*/
function getElementsByClassName(oElm, strTagName, oClassNames){
	var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
	var arrReturnElements = new Array();
	var arrRegExpClassNames = new Array();
	if(typeof oClassNames == "object"){
		for(var i=0; i<oClassNames.length; i++){
			arrRegExpClassNames[arrRegExpClassNames.length] =
				new RegExp("(^|\\s)" + oClassNames[i].replace(/\-/g, "\\-") + "(\\s|$)");
		}
	}
	else{
		arrRegExpClassNames[arrRegExpClassNames.length] =
			new RegExp("(^|\\s)" + oClassNames.replace(/\-/g, "\\-") + "(\\s|$)");
	}
	var oElement;
	var bMatchesAll;
	for(var j=0; j<arrElements.length; j++){
		oElement = arrElements[j];
		bMatchesAll = true;
		for(var k=0; k<arrRegExpClassNames.length; k++){
			if(!arrRegExpClassNames[k].test(oElement.className)){
				bMatchesAll = false;
				break;
			}
		}
		if(bMatchesAll){
			arrReturnElements[arrReturnElements.length] = oElement;
		}
	}
	return (arrReturnElements)
}

function redirectToFragment(fragment) {
	var match = navigator.userAgent.match(/AppleWebKit\/(\d+)/);
	if (match) {
		var webKitVersion = parseInt(match[1]);
		if (webKitVersion < 420) {
			// Released Safari w/ WebKit 418.9.1 messes up horribly
			// Nightlies of 420+ are ok
			return;
		}
	}
	if (is_gecko) {
		// Mozilla needs to wait until after load, otherwise the window doesn't scroll
		addOnloadHook(function () {
			if (window.location.hash == "")
				window.location.hash = fragment;
		});
	} else {
		if (window.location.hash == "")
			window.location.hash = fragment;
	}
}

/*
 * Table sorting script  by Joost de Valk, check it out at http://www.joostdevalk.nl/code/sortable-table/.
 * Based on a script from http://www.kryogenix.org/code/browser/sorttable/.
 * Distributed under the MIT license: http://www.kryogenix.org/code/browser/licence.html .
 *
 * Copyright (c) 1997-2006 Stuart Langridge, Joost de Valk.
 *
 * @todo don't break on colspans/rowspans (bug 8028)
 * @todo language-specific digit grouping/decimals (bug 8063)
 * @todo support all accepted date formats (bug 8226)
 */

var ts_image_path = stylepath+"/common/images/";
var ts_image_up = "sort_up.gif";
var ts_image_down = "sort_down.gif";
var ts_image_none = "sort_none.gif";
var ts_europeandate = wgContentLanguage != "en"; // The non-American-inclined can change to "true"
var ts_alternate_row_colors = true;
var SORT_COLUMN_INDEX;

function sortables_init() {
	var idnum = 0;
	// Find all tables with class sortable and make them sortable
	var tables = getElementsByClassName(document, "table", "sortable");
	for (var ti = 0; ti < tables.length ; ti++) {
		if (!tables[ti].id) {
			tables[ti].setAttribute('id','sortable_table_id_'+idnum);
			++idnum;
		}
		ts_makeSortable(tables[ti]);
	}
}

function ts_makeSortable(table) {
	var firstRow;
	if (table.rows && table.rows.length > 0) {
		if (table.tHead && table.tHead.rows.length > 0) {
			firstRow = table.tHead.rows[table.tHead.rows.length-1];
		} else {
			firstRow = table.rows[0];
		}
	}
	if (!firstRow) return;

	// We have a first row: assume it's the header, and make its contents clickable links
	for (var i = 0; i < firstRow.cells.length; i++) {
		var cell = firstRow.cells[i];
		if ((" "+cell.className+" ").indexOf(" unsortable ") == -1) {
			cell.innerHTML += '&nbsp;&nbsp;<a href="#" class="sortheader" onclick="ts_resortTable(this);return false;"><span class="sortarrow"><img src="'+ ts_image_path + ts_image_none + '" alt="&darr;"/></span></a>';
		}
	}
	if (ts_alternate_row_colors) {
		ts_alternate(table);
	}
}

function ts_getInnerText(el) {
	if (typeof el == "string") return el;
	if (typeof el == "undefined") { return el };
	if (el.textContent) return el.textContent; // not needed but it is faster
	if (el.innerText) return el.innerText;     // IE doesn't have textContent
	var str = "";

	var cs = el.childNodes;
	var l = cs.length;
	for (var i = 0; i < l; i++) {
		switch (cs[i].nodeType) {
			case 1: //ELEMENT_NODE
				str += ts_getInnerText(cs[i]);
				break;
			case 3:	//TEXT_NODE
				str += cs[i].nodeValue;
				break;
		}
	}
	return str;
}

function ts_resortTable(lnk) {
	// get the span
	var span = lnk.getElementsByTagName('span')[0];

	var td = lnk.parentNode;
	var tr = td.parentNode;
	var column = td.cellIndex;

	var table = tr.parentNode;
	while (table && !(table.tagName && table.tagName.toLowerCase() == 'table'))
		table = table.parentNode;
	if (!table) return;

	// Work out a type for the column
	if (table.rows.length <= 1) return;

	// Skip the first row if that's where the headings are
	var rowStart = (table.tHead && table.tHead.rows.length > 0 ? 0 : 1);

	var itm = "";
	for (var i = rowStart; i < table.rows.length; i++) {
		if (table.rows[i].cells.length > column) {
			itm = ts_getInnerText(table.rows[i].cells[column]);
			itm = itm.replace(/^[\s\xa0]+/, "").replace(/[\s\xa0]+$/, "");
			if (itm != "") break;
		}
	}

	sortfn = ts_sort_caseinsensitive;
	if (itm.match(/^\d\d[\/. -][a-zA-Z]{3}[\/. -]\d\d\d\d$/))
		sortfn = ts_sort_date;
	if (itm.match(/^\d\d[\/.-]\d\d[\/.-]\d\d\d\d$/))
		sortfn = ts_sort_date;
	if (itm.match(/^\d\d[\/.-]\d\d[\/.-]\d\d$/))
		sortfn = ts_sort_date;
	if (itm.match(/^[\u00a3$\u20ac]/)) // pound dollar euro
		sortfn = ts_sort_currency;
	if (itm.match(/^[\d.,]+\%?$/))
		sortfn = ts_sort_numeric;

	var reverse = (span.getAttribute("sortdir") == 'down');

	var newRows = new Array();
	for (var j = rowStart; j < table.rows.length; j++) {
		var row = table.rows[j];
		var keyText = ts_getInnerText(row.cells[column]);
		var oldIndex = (reverse ? -j : j);

		newRows[newRows.length] = new Array(row, keyText, oldIndex);
	}

	newRows.sort(sortfn);

	var arrowHTML;
	if (reverse) {
			arrowHTML = '<img src="'+ ts_image_path + ts_image_down + '" alt="&darr;"/>';
			newRows.reverse();
			span.setAttribute('sortdir','up');
	} else {
			arrowHTML = '<img src="'+ ts_image_path + ts_image_up + '" alt="&uarr;"/>';
			span.setAttribute('sortdir','down');
	}

	// We appendChild rows that already exist to the tbody, so it moves them rather than creating new ones
	// don't do sortbottom rows
	for (var i = 0; i < newRows.length; i++) {
		if ((" "+newRows[i][0].className+" ").indexOf(" sortbottom ") == -1)
			table.tBodies[0].appendChild(newRows[i][0]);
	}
	// do sortbottom rows only
	for (var i = 0; i < newRows.length; i++) {
		if ((" "+newRows[i][0].className+" ").indexOf(" sortbottom ") != -1)
			table.tBodies[0].appendChild(newRows[i][0]);
	}

	// Delete any other arrows there may be showing
	var spans = getElementsByClassName(tr, "span", "sortarrow");
	for (var i = 0; i < spans.length; i++) {
		spans[i].innerHTML = '<img src="'+ ts_image_path + ts_image_none + '" alt="&darr;"/>';
	}
	span.innerHTML = arrowHTML;

	ts_alternate(table);		
}

function ts_dateToSortKey(date) {	
	// y2k notes: two digit years less than 50 are treated as 20XX, greater than 50 are treated as 19XX
	if (date.length == 11) {
		switch (date.substr(3,3).toLowerCase()) {
			case "jan": var month = "01"; break;
			case "feb": var month = "02"; break;
			case "mar": var month = "03"; break;
			case "apr": var month = "04"; break;
			case "may": var month = "05"; break;
			case "jun": var month = "06"; break;
			case "jul": var month = "07"; break;
			case "aug": var month = "08"; break;
			case "sep": var month = "09"; break;
			case "oct": var month = "10"; break;
			case "nov": var month = "11"; break;
			case "dec": var month = "12"; break;
			// default: var month = "00";
		}
		return date.substr(7,4)+month+date.substr(0,2);
	} else if (date.length == 10) {
		if (ts_europeandate == false) {
			return date.substr(6,4)+date.substr(0,2)+date.substr(3,2);
		} else {
			return date.substr(6,4)+date.substr(3,2)+date.substr(0,2);
		}
	} else if (date.length == 8) {
		yr = date.substr(6,2);
		if (parseInt(yr) < 50) { 
			yr = '20'+yr; 
		} else { 
			yr = '19'+yr; 
		}
		if (ts_europeandate == true) {
			return yr+date.substr(3,2)+date.substr(0,2);
		} else {
			return yr+date.substr(0,2)+date.substr(3,2);
		}
	}
	return "00000000";
}

function ts_parseFloat(num) {
	if (!num) return 0;
	num = parseFloat(num.replace(/,/, ""));
	return (isNaN(num) ? 0 : num);
}

function ts_sort_date(a,b) {
	var aa = ts_dateToSortKey(a[1]);
	var bb = ts_dateToSortKey(b[1]);
	return (aa < bb ? -1 : aa > bb ? 1 : a[2] - b[2]);
}

function ts_sort_currency(a,b) {
	var aa = ts_parseFloat(a[1].replace(/[^0-9.]/g,''));
	var bb = ts_parseFloat(b[1].replace(/[^0-9.]/g,''));
	return (aa != bb ? aa - bb : a[2] - b[2]);
}

function ts_sort_numeric(a,b) {
	var aa = ts_parseFloat(a[1]);
	var bb = ts_parseFloat(b[1]);
	return (aa != bb ? aa - bb : a[2] - b[2]);
}

function ts_sort_caseinsensitive(a,b) {
	var aa = a[1].toLowerCase();
	var bb = b[1].toLowerCase();
	return (aa < bb ? -1 : aa > bb ? 1 : a[2] - b[2]);
}

function ts_sort_default(a,b) {
	return (a[1] < b[1] ? -1 : a[1] > b[1] ? 1 : a[2] - b[2]);
}

function ts_alternate(table) {
	// Take object table and get all it's tbodies.
	var tableBodies = table.getElementsByTagName("tbody");
	// Loop through these tbodies
	for (var i = 0; i < tableBodies.length; i++) {
		// Take the tbody, and get all it's rows
		var tableRows = tableBodies[i].getElementsByTagName("tr");
		// Loop through these rows
		// Start at 1 because we want to leave the heading row untouched
		for (var j = 0; j < tableRows.length; j++) {
			// Check if j is even, and apply classes for both possible results
			var oldClasses = tableRows[j].className.split(" ");
			var newClassName = "";
			for (var k = 0; k < oldClasses.length; k++) {
				if (oldClasses[k] != "" && oldClasses[k] != "even" && oldClasses[k] != "odd")
					newClassName += oldClasses[k] + " ";
			}
			tableRows[j].className = newClassName + (j % 2 == 0 ? "even" : "odd");
		}
	}
}

/*
 * End of table sorting code
 */
 
 
/**
 * Add a cute little box at the top of the screen to inform the user of
 * something, replacing any preexisting message.
 *
 * @param String message HTML to be put inside the right div
 * @param String className   Used in adding a class; should be different for each
 *   call to allow CSS/JS to hide different boxes.  null = no class used.
 * @return Boolean       True on success, false on failure
 */
function jsMsg( message, className ) {
	if ( !document.getElementById ) {
		return false;
	}
	// We special-case skin structures provided by the software.  Skins that
	// choose to abandon or significantly modify our formatting can just define
	// an mw-js-message div to start with.
	var messageDiv = document.getElementById( 'mw-js-message' );
	if ( !messageDiv ) {
		messageDiv = document.createElement( 'div' );
		if ( document.getElementById( 'column-content' )
		&& document.getElementById( 'content' ) ) {
			// MonoBook, presumably
			document.getElementById( 'content' ).insertBefore(
				messageDiv,
				document.getElementById( 'content' ).firstChild
			);
		} else if ( document.getElementById('content')
		&& document.getElementById( 'article' ) ) {
			// Non-Monobook but still recognizable (old-style)
			document.getElementById( 'article').insertBefore(
				messageDiv,
				document.getElementById( 'article' ).firstChild
			);
		} else {
			return false;
		}
	}

	messageDiv.setAttribute( 'id', 'mw-js-message' );
	if( className ) {
		messageDiv.setAttribute( 'class', 'mw-js-message-'+className );
	}
	messageDiv.innerHTML = message;
	return true;
}

/**
 * Inject a cute little progress spinner after the specified element
 *
 * @param element Element to inject after
 * @param id Identifier string (for use with removeSpinner(), below)
 */
function injectSpinner( element, id ) {
	var spinner = document.createElement( "img" );
	spinner.id = "mw-spinner-" + id;
	spinner.src = stylepath + "/common/images/spinner.gif";
	spinner.alt = spinner.title = "...";
	if( element.nextSibling ) {
		element.parentNode.insertBefore( spinner, element.nextSibling );
	} else {
		element.parentNode.appendChild( spinner );
	}
}

/**
 * Remove a progress spinner added with injectSpinner()
 *
 * @param id Identifier string
 */
function removeSpinner( id ) {
	var spinner = document.getElementById( "mw-spinner-" + id );
	if( spinner ) {
		spinner.parentNode.removeChild( spinner );
	}
}

function runOnloadHook() {
	// don't run anything below this for non-dom browsers
	if (doneOnloadHook || !(document.getElementById && document.getElementsByTagName)) {
		return;
	}

	// set this before running any hooks, since any errors below
	// might cause the function to terminate prematurely
	doneOnloadHook = true;

	histrowinit();
	unhidetzbutton();
	tabbedprefs();
	updateTooltipAccessKeys( null );
	akeytt( null );
	scrollEditBox();
	setupCheckboxShiftClick();
	sortables_init();

	// Run any added-on functions
	for (var i = 0; i < onloadFuncts.length; i++) {
		onloadFuncts[i]();
	}
}

/**
 * Add an event handler to an element
 *
 * @param Element element Element to add handler to
 * @param String attach Event to attach to
 * @param callable handler Event handler callback
 */
function addHandler( element, attach, handler ) {
	if( window.addEventListener ) {
		element.addEventListener( attach, handler, false );
	} else if( window.attachEvent ) {
		element.attachEvent( 'on' + attach, handler );
	}
}

/**
 * Add a click event handler to an element
 *
 * @param Element element Element to add handler to
 * @param callable handler Event handler callback
 */
function addClickHandler( element, handler ) {
	addHandler( element, 'click', handler );
}
//note: all skins should call runOnloadHook() at the end of html output,
//      so the below should be redundant. It's there just in case.
hookEvent("load", runOnloadHook);
hookEvent("load", mwSetupToolbar);

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