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/*	BEGIN COLLAPSE								*/
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function collapseAll() {
	for ( var i = 0, tag; tag = window.headers[i]; i++) {
		tag.collapse();
	};
};

function expandAll() {
	for ( var i = 0, tag; tag = window.headers[i]; i++) {
		tag.expand();
	};
};

function toggleSection() {
	var oContent = document.getElementById(this.sectionName +"_content");
	oContent.style.display = (this.showing) ? "none" : "block";
	this.showing = (this.showing) ? false : true;
	this.firstChild.firstChild.nodeValue = (this.showing) ? "- " : "+ ";
	this.blur();
	return false;
};

function initCollapse() {
	if (document.getElementsBySelector) {
		var tags = document.getElementsBySelector(".section_header");
		window.headers = new Array;
		
		for (i=0; i<tags.length; i++) {
			
			// Create a temporary placeholder element
			var oTemp = document.createElement("div");
			
			// Create Link Element
			var oLink = document.createElement("a");
			oLink.sectionName = tags[i].id;
			oLink.showing = true;
			oLink.setAttribute("boss", "sdf");
			oLink.setAttribute("href", "#");
			oLink.onclick = toggleSection;
			
			oLink.expand = function() {
				this.showing = false;
				this.onclick();
			};
			
			oLink.collapse = function() {
				this.showing = true;
				this.onclick();
			};
			
			// Add Link Element to window.headers array
			window.headers.push(oLink);
			
			// Create a text element for the +/- symbol on the headers
			var oGlyph = document.createElement("span");
			oGlyph.setAttribute("id", tags[i].id +"_glyph");
			//oGlyph.className = "expand-collapse-glyph";
			oGlyph.appendChild(document.createTextNode("- "));
			
			// Append the +/- element to the Link Element
			oLink.appendChild(oGlyph);
			
			for (j=0; j<tags[i].childNodes.length; j++) {
			  if (tags[i].childNodes[j].tagName != 'a') {
				oLink.appendChild(tags[i].childNodes[j]);
                          }
			}
			tags[i].insertBefore(oLink,tags[i].firstChild);

		}
	};
	setDefault();
};

function setDefault() {
	// Collapse the searchOptions by default
	var sView = readCookie("view");
	if (sView) {
		var arr = sView.split(",");
	} else {
	  var arr = ["classesTutsAppts","services","facultyServices","aboutUs","myQuickLinks","searchOptions","sourcesSubject","quickGenRef","requestMaterials","theCommons","searchSite","suggestionBox"];
	}
	
	for ( var i = 0, tag; tag = window.headers[i]; i++) {
		for ( var j=0; j<arr.length; j++) {
			if (tag.parentNode.id == arr[j]) {
				tag.collapse();
			}
		}
	}
};

function saveCollapse() {
	var arr = new Array();
	for ( var i = 0, tag; tag = window.headers[i]; i++) {
		if (!tag.showing) {
			arr.push(tag.parentNode.id);
		}
	}
//	alert(arr.join("\n"));
	createCookie("view",arr.join(","),365);
};

addEvent(window,"load", initCollapse, false);

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/*	END COLLAPSE								*/
/************************************************/









/************************************************/
/*	BEGIN STYLE SWITCHER						*/
/************************************************/

function setActiveStyleSheet(title) {
	var i, a, main;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
			a.disabled = true;
			if(a.getAttribute("title") == title) a.disabled = false;
		};
	};
};

function getActiveStyleSheet() {
	var i, a;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
	};
	return null;
};

function getPreferredStyleSheet() {
	var i, a;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("rel").indexOf("style") != -1
		&& a.getAttribute("rel").indexOf("alt") == -1
		&& a.getAttribute("title")
		) return a.getAttribute("title");
	};
	return null;
};

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	} else {
		expires = "";
	};
	document.cookie = name+"="+value+expires+"; path=/";
};

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	};
	return null;
};

function styleInit() {
	var cookie = readCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
};

function styleUnInit() {
	var title = getActiveStyleSheet();
	createCookie("style", title, 365);
	saveCollapse(); // Saves the current "view" of the home page.
};

addEvent(window, "load", styleInit, false);
addEvent(window, "unload", styleUnInit, false);

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();

setActiveStyleSheet(title); 

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/*	END STYLE SWITCHER							*/
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