var W3CDOM = (document.createElement && document.getElementsByTagName);

var mouseOvers = new Array();
var mouseOuts = new Array();
var rolloverCounter = 0;

//window.onload = init;

if (typeof document.defaultView == 'undefined') {
	document.defaultView = {};
}
if (typeof document.defaultView.getComputedStyle == 'undefined') {
	document.defaultView.getComputedStyle = function(element, pseudoElement) {
		return element.currentStyle;
	}
}

function initRollover() {
	initSome('topIcons', '-hover');
	//initSomeCSS('mainmenu', '-hover');
}

function initSome(id, prefix) {
	if (!W3CDOM) return;
	var nav = document.getElementById(id);
	var imgs = nav.getElementsByTagName('img');
	for (var i = 0; i < imgs.length; i++) {
		rolloverCounter++;
		imgs[i].onmouseover = mouseGoesOver;
		imgs[i].onmouseout = mouseGoesOut;
		var suffix = imgs[i].src.substring(imgs[i].src.lastIndexOf('.'));
		mouseOuts[rolloverCounter] = new Image();
		mouseOuts[rolloverCounter].src = imgs[i].src;
		mouseOvers[rolloverCounter] = new Image();
		if (imgs[i].src.indexOf(prefix) != -1) {
			mouseOvers[rolloverCounter].src = imgs[i].src;
		}
		else {
			mouseOvers[rolloverCounter].src = imgs[i].src.substring(0, imgs[i].src.lastIndexOf('.')) + prefix + suffix;
		}
		imgs[i].number = rolloverCounter;
	}
}

function mouseGoesOver() {
	this.src = mouseOvers[this.number].src;
}

function mouseGoesOut() {
	this.src = mouseOuts[this.number].src;
}

/*function initSomeCSS(id, prefix) {
	if (!W3CDOM) return;
	var nav = document.getElementById(id);
	var tags = nav.getElementsByTagName('a');
	for (var i = 0; i < tags.length; i++) {
		rolloverCounter++;
		tags[i].onmouseover = mouseGoesOverCSS;
		tags[i].onmouseout = mouseGoesOutCSS;
		var cs = document.defaultView.getComputedStyle(tags[i]);
		var imageUri = cs.backgroundImage.toString();
		var url = imageUri.substring(5, imageUri.lastIndexOf('"'));
		var suffix = url.substring(url.lastIndexOf('.'));
		mouseOuts[rolloverCounter] = new Image();
		mouseOuts[rolloverCounter].src = url;
		mouseOvers[rolloverCounter] = new Image();
		mouseOvers[rolloverCounter].src = url.substring(0, url.lastIndexOf('.')) + prefix + suffix;
		tags[i].number = rolloverCounter;
	}
}

function mouseGoesOverCSS() {
	this.style.backgroundImage = 'url(' + mouseOvers[this.number].src + ')';
}

function mouseGoesOutCSS() {
	this.style.backgroundImage = 'url(' + mouseOuts[this.number].src + ')';
}*/