function drawmenu(){
    if(!document.getelementbyid("nav")){
        return false;
    }
	var objarr = document.getelementbyid("nav").getelementsbytagname("h2");
	for(var x = 0; x < objarr.length; x++){
		var obj = objarr[x].parentnode;
		var objul = obj.getelementsbytagname("ul")[0];
		if (!objul) {
        	continue;
		}
		else {
			var objli = objul.getelementsbytagname("li");
			type();
		}
	}
	function type(){
		obj.onmouseover = show(objul);
		obj.onmouseout = hide(objul);
		function show(_obj){
			return function(){

					_obj.classname = "clearfix typeul block";
				
				//修正li的宽度值及定位值
				var pleft=_obj.clientwidth;
				if (pleft > 100){
					//var cli = clearwhitespaces(_obj);
					for (var c=0; c<_obj.childnodes.length;c++){
						var cli = _obj.childnodes[c];
						if(cli.nodename.tolowercase() == "li"){
							cli.style.width = pleft + "px";
							if(cli.getelementsbytagname("ul")[0]){
								cli.getelementsbytagname("ul")[0].style.left = pleft +"px";
							}
						}
					}
				}
				//end  column.nodename.tolowercase() == "div"
			}
		}
		function hide(_obj){
			return function(){

					_obj.classname = "clearfix typeul";

			}
		}
		
		for(var i = 0; i < objli.length; i++){
		 var liul = objli[i].getelementsbytagname("ul")[0];
		 
			if (!liul){
				continue;
			}else{
				typeshow();
			}
			
		}
		
		function typeshow(){
			objli[i].onmouseover = showul(objli[i]);
			objli[i].onmouseout = hideul(objli[i]);
		}
		function showul(_obj){
			return function(){

					_obj.getelementsbytagname("ul")[0].classname = "block clearfix";

				//修正li的宽度值及定位值
				var obj_ul = _obj.getelementsbytagname("ul")[0];
				var lipleft = obj_ul.clientwidth;
				if (lipleft > 100){
					//var uli = cleanwhitespaces(obj_ul);
					for (var u=0; u<obj_ul.childnodes.length;u++){
						var uli = obj_ul.childnodes[u];
						if(uli.nodename.tolowercase() == "li"){
							uli.style.width = lipleft + "px";
							if (uli.getelementsbytagname("ul")[0]){
								uli.getelementsbytagname("ul")[0].style.left = lipleft +"px";
							};
						}
					};

					//document.getelementbyid("get").value = currentstyle(obj_ul).width;
				}
				
				//console.log(lipleft.clientwidth, lipleft.scrollwidth, lipleft.offsetwidth)
				
				//end
			}
		}
		function hideul(_obj){
			return function(){

					_obj.getelementsbytagname("ul")[0].classname = "";

			}
		}
	}
}