var mypath="index_a" ;
function load_menu(path){
   var menu = document.getElementById("menu") ;
   var id = path+"_a"
   mypath = id ;
   var lis = menu.childNodes ;
   for(var i = 0 ;i < lis.length ; i++){
         var li = lis[i];
         var li_a = document.getElementById(li.id+"_a") ;
         if(li_a.id == id){
            li_a.className="active"
            if(id == "overview_a"){
                show("overview_sub","classic_case_sub") ;
            }
            if(id == "classic_case_a"){
                show("classic_case_sub","overview_sub") ;
            }
         }else{
            li_a.className="" ;
         }
         //alert(li_a.className) ;
   }
}
  function show(id1,id2){
     document.getElementById(id1).style.display="" ;
     document.getElementById(id2).style.display="none" ;
  }
  function static_active_dis(){
     document.getElementById(mypath).className="" ;
  }
  function static_active_show(){
     document.getElementById(mypath).className="active" ;
  }
  function display(id1,id2){
     document.getElementById(id1).style.display="none" ;
     document.getElementById(id2).style.display="none" ;
  }
  function whenClick(id){
     var menu = document.getElementById("menu") ;
     var lis = menu.childNodes ;
     for(var i = 0 ;i < lis.length ; i++){
         var li = lis[i];
         var li_a = document.getElementById(li.id+"_a") ;
         if(li_a.id == id){
            li_a.className="active"
         }else{
            li_a.className="" ;
         }
         //alert(li_a.className) ;
     }
  }