function showMenu(val,menuid,pic){
  var obj=eval(val);
  obj.style.backgroundImage="url("+pic+")";
  
  var target_obj=document.getElementById(menuid);
  if(target_obj==null) return false;
  if(target_obj.style.display=='none'){
    var target_left=0;
    var target_top=0;
    for(var e=val; e; e=e.offsetParent){
      target_left+=e.offsetLeft;target_top+=e.offsetTop
    }
    target_top +=25;
    target_obj.style.top=target_top+'px';
    target_obj.style.left=target_left+'px';
    target_obj.style.display='';
  }else{
    target_obj.style.display='none';
  }  
 }