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 init () {
	getTabData('read');
}

function getTabData(id) {
	var rand = Math.random();
	var url  = '/' + id + '.php?' + rand;

	var myAjax = new Ajax.Request( url, 
	    { 
	        method:'get', 
	        onComplete: function(request) {
	            var tabContent = request.responseText;
	            var tabs = getElementsByClassName('tabs');
	            for (var i = 0; i < tabs.length; i++) {
	                $(tabs[i].id).style.background = '#f0f1f5';
        	    }
	            document.getElementById(id).style.background = "#fff";
	            document.getElementById('tabContent').innerHTML = tabContent;
	        }, 
	        onFailure: function() { 
	            alert('Something went wrong...')
	        }
	    } 
	);
}

function showTheDiv(divToShow) {
	el = document.getElementById(divToShow);
	
	if (el.style.display == 'none') {
		el.style.display    = 'block';
		el.style.visibility = 'visible';
	} else {
		el.style.display    = 'none';
		el.style.visibility = 'hidden';
	}
}

function getSubcategoriesSelect(MainCat) {
	// Take the Main Category as a Param, and return the subcategories for it
	// The server will return a <select> form element with subcategories as <options>s
	// uses get_subcategories.php for server processing
	var myAjax = new Ajax.Request( '../cgi-bin/get_subcategories.php', 
	    { 
	        method:'post', 
		postBody: 'Category=' + MainCat,
	        onComplete: function(request) {
	            	var Subcategories = request.responseText;
			document.getElementById('SubcategoriesSelect').innerHTML = Subcategories;
			//$('SubcategoriesSelect').update(Subcategories);	            
	        }, 
	        onFailure: function() { 
	            alert('Unable to retrieve subcategories')
	        }
	    } 
	);
}

function RedirectToPage(url) {
	window.location = url;
	return false;
}

stuHover = function() {
	var cssRule;
	var newSelector;
	for (var i = 0; i < document.styleSheets.length; i++)
		for (var x = 0; x < document.styleSheets[i].rules.length ; x++)
			{
			cssRule = document.styleSheets[i].rules[x];
			if (cssRule.selectorText.indexOf("LI:hover") >= 0)
			{
				newSelector = cssRule.selectorText.replace(/li:hover/gi, "li.iehover");
				newSelector.toString();
				document.styleSheets[i].addRule(newSelector, cssRule.style.cssText);
			}
		}
	var getElm = document.getElementById("nav").getElementsByTagName("li");
	for (var i=0; i<getElm.length; i++) {
		getElm[i].onmouseover=function() {
			this.className+=" iehover";
		}
		getElm[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" iehover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", stuHover);