function setStyleAttribute(_el,_value){
	_el.setAttribute("style",_value);
	_el.style.cssText = _value;
}

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_ul = node.getElementsByTagName("UL");
        if(node_ul[0]) setStyleAttribute(node_ul[0],"width:"+(node.offsetWidth-2)+"px;");
        node.onmouseover=function() {
          this.className+=" over";
        }
        node.onmouseout=function() {
          this.className=this.className.replace(" over", "");
        }
      }
    }
  
  }

}
window.onload=startList;