function swapImg(val,currentId)
{
	var thisImg = document.getElementById(currentId);
	var imgPath = thisImg.src;
	var searchStr = imgPath.lastIndexOf(".");
	searchStr = searchStr - 1;
	var pattern = imgPath.substring(searchStr);
	var newVal = val + ".gif";
	var result = imgPath.replace(pattern, newVal);
	thisImg.src = result;
}

startList = function() {
	if (document.all && document.getElementById) {
	navRoot = document.getElementById("nav");
		for (i=0; i < navRoot.childNodes.length; i++) {
			node = navRoot.childNodes[i];
				if (node.nodeName=="LI") {
				node.onmouseover=function() {
					this.className+=" over";
				}
				node.onmouseout=function() {
					this.className=this.className.replace(" over", "");
				}
			}
		}
	}
}
window.onload = startList;