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;
	tabbedprefs();


	// 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);
}

// 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();
	var children = prefform.childNodes;
	var seci = 0;
	for (var i = 0; i < children.length; i++) {
		if (children[i].nodeName.toLowerCase() == 'div') {
			children[i].id = 'prefsection-' + seci;
			children[i].className = 'prefsection';
			if (is_opera || is_khtml)
				children[i].className = 'prefsection operaprefsection';
			var legends = children[i].getElementsByTagName('span');
			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() {
	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;
}