function initNav()
{
	var navItemClass="navItem";

	for(var i=0; i < document.getElementsByTagName("img").length; i++)
	{
		if(document.getElementsByTagName("img")[i].className == navItemClass)
		{
			document.getElementsByTagName("img")[i].onmouseover=function(){
				this.src = this.src.split(".jpg")[0] + "_h.jpg";
			}

			document.getElementsByTagName("img")[i].onmouseout=function(){
				this.src = this.src.split("_h.jpg")[0] + ".jpg";
			}
		}
	}
}