var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};

function getNextSibling(startBrother) {
	endBrother=startBrother.nextSibling;
	while(endBrother.nodeType!=1) {
		endBrother = endBrother.nextSibling;
	}
	return endBrother;
} 

function hideContent() {
	if (!document.getElementById) return false;
	if (!document.getElementsByTagName) return false;
	
	var tabContents = getElementsByClassName("tab_content");
	if (tabContents.length == 0) return false;
	
	/*
	for (var i=0; i<tabContents.length; i++) {
		tabContents[i].style.display = "none";
	}
	*/
	showContent();
}

function showContent() {
	var content = document.getElementById("content")
	var headers = content.getElementsByTagName("h4");
	
	for (var i=0; i<headers.length; i++) {
		var link = headers[i].childNodes[0];
		link.onclick = function() {
			var parent = this.parentNode;
			var div = getNextSibling(parent);
			if (div.style.display == "none") {
				div.style.display = "block";
				this.className = "active";
			}else{
				div.style.display = "none";
				this.className = "";
			}
			var state = true;
			return false;
		}
	}
	
}

window.onload = function() {
	hideContent()
}