// Wikipedia 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 ));

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);

}



// 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 runOnloadHook() {

	// don't run anything below this for non-dom browsers

	if (doneOnloadHook || !(document.getElementById && document.getElementsByTagName))

		return;



	histrowinit();

	unhidetzbutton();

	tabbedprefs();

	akeytt();

	scrollEditBox();

	setupCheckboxShiftClick();



	// Run any added-on functions

	for (var i = 0; i < onloadFuncts.length; i++)

		onloadFuncts[i]();



	doneOnloadHook = true;

}



function hookEvent(hookName, hookFunct) {

	if (window.addEventListener)

		addEventListener(hookName, hookFunct, false);

	else if (window.attachEvent)

		attachEvent("on" + hookName, hookFunct);

}



hookEvent("load", runOnloadHook);



// 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) {

		document.write('<link rel="stylesheet" type="text/css" href="'+stylepath+'/'+skin+'/Opera7Fixes.css">');

	} else if (is_khtml) {

		document.write('<link rel="stylesheet" type="text/css" href="'+stylepath+'/'+skin+'/KHTMLFixes.css">');

	}

}

// 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';

	}

}



// 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 (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();

}



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;

	var lis = hf.getElementsByTagName('li');

	for (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 = "";

			}

		}

	}

}



// 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 = new Array();

	children = prefform.childNodes;

	var seci = 0;

	for (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';

			legends = children[i].getElementsByTagName('legend');

			sections[seci] = new Object();

			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() {

	oldsecid = this.parentNode.parentNode.selectedid;

	newsec = document.getElementById(this.secid);

	if (oldsecid != this.secid) {

		ul = document.getElementById('preftoc');

		document.getElementById(oldsecid).style.display = 'none';

		newsec.style.display = 'block';

		ul.selectedid = this.secid;

		lis = ul.getElementsByTagName('li');

		for (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() {

	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";

	}

}



// 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) {

	// Don't generate buttons for browsers which don't fully

	// support it.

	if (!document.selection && !is_gecko) {

		return false;

	}

	imageFile = escapeQuotesHTML(imageFile);

	speedTip = escapeQuotesHTML(speedTip);

	tagOpen = escapeQuotes(tagOpen);

	tagClose = escapeQuotes(tagClose);

	sampleText = escapeQuotes(sampleText);

	var mouseOver = "";



	document.write("<a href=\"javascript:insertTags");

	document.write("('"+tagOpen+"','"+tagClose+"','"+sampleText+"');\">");

	document.write("<img width=\"23\" height=\"22\" src=\""+imageFile+"\" border=\"0\" alt=\""+speedTip+"\" title=\""+speedTip+"\""+mouseOver+">");

	document.write("</a>");

	return;

}



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;");

	var re = new RegExp('"',"g");

	text = text.replace(re,"&quot;");

	var re = new RegExp('<',"g");

	text = text.replace(re,"&lt;");

	var 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

// copied and adapted from phpBB

function insertTags(tagOpen, tagClose, sampleText) {

	if (document.editform)

		var txtarea = document.editform.wpTextbox1;

	else {

		// some alternate form? take the first one we can find

		var areas = document.getElementsByTagName('textarea');

		var txtarea = areas[0];

	}



	// IE

	if (document.selection  && !is_gecko) {

		var theSelection = document.selection.createRange().text;

		if (!theSelection)

			theSelection=sampleText;

		txtarea.focus();

		if (theSelection.charAt(theSelection.length - 1) == " ") { // exclude ending space char, if any

			theSelection = theSelection.substring(0, theSelection.length - 1);

			document.selection.createRange().text = tagOpen + theSelection + tagClose + " ";

		} else {

			document.selection.createRange().text = tagOpen + theSelection + tagClose;

		}



	// Mozilla

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

		var replaced = false;

		var startPos = txtarea.selectionStart;

		var endPos = txtarea.selectionEnd;

		if (endPos-startPos)

			replaced = true;

		var scrollTop = txtarea.scrollTop;

		var myText = (txtarea.value).substring(startPos, endPos);

		if (!myText)

			myText=sampleText;

		if (myText.charAt(myText.length - 1) == " ") { // exclude ending space char, if any

			subst = tagOpen + myText.substring(0, (myText.length - 1)) + tagClose + " ";

		} else {

			subst = tagOpen + myText + tagClose;

		}

		txtarea.value = txtarea.value.substring(0, startPos) + subst +

			txtarea.value.substring(endPos, txtarea.value.length);

		txtarea.focus();

		//set new selection

		if (replaced) {

			var cPos = startPos+(tagOpen.length+myText.length+tagClose.length);

			txtarea.selectionStart = cPos;

			txtarea.selectionEnd = cPos;

		} else {

			txtarea.selectionStart = startPos+tagOpen.length;

			txtarea.selectionEnd = startPos+tagOpen.length+myText.length;

		}

		txtarea.scrollTop = scrollTop;



	// All other browsers get no toolbar.

	// There was previously support for a crippled "help"

	// bar, but that caused more problems than it solved.

	}

	// reposition cursor if possible

	if (txtarea.createTextRange)

		txtarea.caretPos = document.selection.createRange().duplicate();

}



function akeytt() {

	if (typeof ta == "undefined" || !ta)

		return;

	var pref = 'alt-';

	if (is_safari || navigator.userAgent.toLowerCase().indexOf('mac') + 1

		|| navigator.userAgent.toLowerCase().indexOf('konqueror') + 1 )

		pref = 'control-';

	if (is_opera)

		pref = 'shift-esc-';



	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];

				}



				if (a) {

					a.accessKey = ta[id][0];

					ak = ' ['+pref+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 divs = document.getElementsByTagName('div');

		for (var i = 0; i < divs.length; i++) {

			var el = divs[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 following a

			var next = el.nextSibling;

			while (next.nodeType != 1)

				next = next.nextSibling;



			// find the following header

			next = next.nextSibling;

			while (next.nodeType != 1)

				next = next.nextSibling;



			if (next && next.nodeType == 1 &&

				next.nodeName.match(/^[Hh][1-6]$/)) {

				next.oncontextmenu = function() {

					document.location = editHref;

					return false;

				}

			}

		}

	}

}



function setupCheckboxShiftClick() {

	if (document.getElementsByTagName) {

		var uls = document.getElementsByTagName('ul');

		var len = uls.length;

		for (var i = 0; i < len; ++i) {

			addCheckboxClickHandlers(uls[i]);

		}

	}

}



function addCheckboxClickHandlers(ul, start, finish) {

	if (ul.checkboxHandlersTimer) {

		clearInterval(ul.checkboxHandlersTimer);

	}

	if ( !ul.childNodes ) {

		return;

	}

	var len = ul.childNodes.length;

	if (len < 2) {

		return;

	}

	start = start || 0;

	finish = finish || start + 250;

	if ( finish > len ) { finish = len; }

	ul.checkboxes = ul.checkboxes || [];

	ul.lastCheckbox = ul.lastCheckbox || null;

	for (var i = start; i<finish; ++i) {

		var child = ul.childNodes[i];

		if ( child && child.childNodes && child.childNodes[0] ) {

			var cb = child.childNodes[0];

			if ( !cb.nodeName || cb.nodeName.toLowerCase() != 'input' ||

			     !cb.type || cb.type.toLowerCase() != 'checkbox' ) {

				return;

			}

			cb.index = ul.checkboxes.push(cb) - 1;

			cb.container = ul;

			cb.onmouseup = checkboxMouseupHandler;

		}

	}

	if (finish < len) {

	  var f=function(){ addCheckboxClickHandlers(ul, finish, finish+250); };

	  ul.checkboxHandlersTimer=setInterval(f, 200);

	}

}



function checkboxMouseupHandler(e) {

	if (typeof e == 'undefined') {

		e = window.event;

	}

	if ( !e.shiftKey || this.container.lastCheckbox === null ) {

		this.container.lastCheckbox = this.index;

		return true;

	}

	var endState = !this.checked;

	if ( is_opera ) { // opera has already toggled the checkbox by this point

		endState = !endState;

	}

	var start, finish;

	if ( this.index < this.container.lastCheckbox ) {

		start = this.index + 1;

		finish = this.container.lastCheckbox;

	} else {

		start = this.container.lastCheckbox;

		finish = this.index - 1;

	}

	for (var i = start; i <= finish; ++i ) {

		this.container.checkboxes[i].checked = endState;

	}

	this.container.lastCheckbox = this.index;

	return true;

}



function fillDestFilename() {

	if (!document.getElementById)

		return;

	var path = document.getElementById('wpUploadFile').value;

	// Find trailing part

	var slash = path.lastIndexOf('/');

	var backslash = path.lastIndexOf('\\');

	var fname;

	if (slash == -1 && backslash == -1) {

		fname = path;

	} else if (slash > backslash) {

		fname = path.substring(slash+1, 10000);

	} else {

		fname = path.substring(backslash+1, 10000);

	}



	// Capitalise first letter and replace spaces by underscores

	fname = fname.charAt(0).toUpperCase().concat(fname.substring(1,10000)).replace(/ /g, '_');



	// Output result

	var destFile = document.getElementById('wpDestFile');

	if (destFile)

		destFile.value = fname;

}





function considerChangingExpiryFocus() {

	if (!document.getElementById)

		return;

	var drop = document.getElementById('wpBlockExpiry');

	if (!drop)

		return;

	var field = document.getElementById('wpBlockOther');

	if (!field)

		return;

	var opt = drop.value;

	if (opt == 'other')

		field.style.display = '';

	else

		field.style.display = 'none';

}



function scrollEditBox() {

	var editBoxEl = document.getElementById("wpTextbox1");

	var scrollTopEl = document.getElementById("wpScrolltop");

	var editFormEl = document.getElementById("editform");



	if (editBoxEl && scrollTopEl) {

		if (scrollTopEl.value) editBoxEl.scrollTop = scrollTopEl.value;

		editFormEl.onsubmit = function() {

			document.getElementById("wpScrolltop").value = document.getElementById("wpTextbox1").scrollTop;

		}

	}

}



hookEvent("load", scrollEditBox);



function allmessagesfilter() {

	text = document.getElementById('allmessagesinput').value;

	k = document.getElementById('allmessagestable');

	if (!k) { return;}



	var items = k.getElementsByTagName('span');



	if ( text.length > allmessages_prev.length ) {

		for (var i = items.length-1, j = 0; i >= 0; i--) {

			j = allmessagesforeach(items, i, j);

		}

	} else {

		for (var i = 0, j = 0; i < items.length; i++) {

			j = allmessagesforeach(items, i, j);

		}

	}

	allmessages_prev = text;

}



function allmessagesforeach(items, i, j) {

	var hItem = items[i].getAttribute('id');

	if (hItem.substring(0,17) == 'sp-allmessages-i-') {

		if (items[i].firstChild && items[i].firstChild.nodeName == '#text' && items[i].firstChild.nodeValue.indexOf(text) != -1) {

			var itemA = document.getElementById( hItem.replace('i', 'r1') );

			var itemB = document.getElementById( hItem.replace('i', 'r2') );

			if ( itemA.style.display != '' ) {

				var s = "allmessageshider(\"" + hItem.replace('i', 'r1') + "\", \"" + hItem.replace('i', 'r2') + "\", '')";

				var k = window.setTimeout(s,j++*5);

			}

		} else {

			var itemA = document.getElementById( hItem.replace('i', 'r1') );

			var itemB = document.getElementById( hItem.replace('i', 'r2') );

			if ( itemA.style.display != 'none' ) {

				var s = "allmessageshider(\"" + hItem.replace('i', 'r1') + "\", \"" + hItem.replace('i', 'r2') + "\", 'none')";

				var k = window.setTimeout(s,j++*5);

			}

		}

	}

	return j;

}





function allmessageshider(idA, idB, cstyle) {

	var itemA = document.getElementById( idA );

	var itemB = document.getElementById( idB );

	if (itemA) { itemA.style.display = cstyle; }

	if (itemB) { itemB.style.display = cstyle; }

}



function allmessagesmodified() {

	allmessages_modified = !allmessages_modified;

	k = document.getElementById('allmessagestable');

	if (!k) { return;}

	var items = k.getElementsByTagName('tr');

	for (var i = 0, j = 0; i< items.length; i++) {

		if (!allmessages_modified ) {

			if ( items[i].style.display != '' ) {

				var s = "allmessageshider(\"" + items[i].getAttribute('id') + "\", null, '')";

				var k = window.setTimeout(s,j++*5);

			}

		} else if (items[i].getAttribute('class') == 'def' && allmessages_modified) {

			if ( items[i].style.display != 'none' ) {

				var s = "allmessageshider(\"" + items[i].getAttribute('id') + "\", null, 'none')";

				var k = window.setTimeout(s,j++*5);

			}

		}

	}

}



function allmessagesshow() {

	k = document.getElementById('allmessagesfilter');

	if (k) { k.style.display = ''; }



	allmessages_prev = '';

	allmessages_modified = false;

}



hookEvent("load", allmessagesshow);