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";
					//added by jack
					var tmpUlObj = this.getElementsByTagName('ul');
					if(tmpUlObj && tmpUlObj[0]){
						tmpUlObj[0].style.height = 'auto';
					}
				}         
					node.onmouseout=function() {          
						this.className=this.className.replace(" over", ""); 
					}      
			}    
		}   
	}

}
window.onload=startList;