function initLeftNav()
   {
    var node = new NodeControl();
    var uls = $("nav-product").getElementsByTagName("ul");
    var e = new EventControl();
    var childs = uls[0].childNodes;
/*
 ***** if in background .
*/
var re = /wendyusa/i;
if(!re.test(location)){
  
    for(var j=0,i=1;j<childs.length;j++)
        $("nav"+(i++)).style.display = "none";
  return;
}
/*
 ***** if in detail page
*/
var is_detail_page = true;

var myIntro = document.getElementById("introtext");
var imgSrc = getImageSrc();
if(!myIntro||!imgSrc)
 is_detail_page = false;
if(myIntro)
  var isAdd = myIntro.style.display;
if(!re.test(location)||isAdd == "none")
 is_detail_page = false; 

    for(var j=0,i=1;j<childs.length;j++)
    {
     if(childs[j].nodeName=="LI")
     {
      function add(){
       //得到一级菜单
       var as = childs[j].getElementsByTagName("a");
       if(as.length == 0)
        return;
       //得到二级菜单
       var childNav = $("nav"+(i++));
       if(!childNav)return;
       if(is_detail_page)
         childNav.style.display = "none";
       var a = as[0];
//       a.href="javascript:;"
       //将二级菜单添加到一级菜单下
       childs[j].appendChild(childNav);
      }
      add();
     }
    }
   }