function preloadHeaderLinks()
{
	if(document.getElementById('headerLinks'))
	{
		var aNodes = document.getElementById('headerLinks').getElementsByTagName('img');
		for (var i = 0; i < aNodes.length; i++)
		{
			var tmpImage = new Image();
			var src = aNodes[1].src.substr(0, aNodes[1].src.lastIndexOf("."));
			tmpImage.src = src + "_on.gif";
			aNodes[i].onmouseover = headerOver;
			aNodes[i].onmouseout = headerOut;
		}
	}
}

function headerOver() {
	var src = this.src.substr(0, this.src.lastIndexOf("."));
	this.src = src + "_on.gif";
}

function headerOut() {
	var src = this.src.substr(0, this.src.lastIndexOf("_on.gif"));
	if(src != "")
		this.src = src + ".gif";
}

addLoadEvent(preloadHeaderLinks);