startList = function() {
		if (document.all && document.getElementById) {
		navRoot = document.getElementById("main_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;