var DHTML = (document.getElementById || document.all || document.layers);
  
  function getObj(name)
  {
    if (document.getElementById && document.getElementById(name))
    {
      this.obj = document.getElementById(name);
      this.style = document.getElementById(name).style;
    }
    else if (document.all && document.all[name])
    {
      this.obj = document.all[name];
      this.style = document.all[name].style;
    }
    else if (document.layers && document.layers[name])
    {
      this.obj = document.layers[name];
      this.style = document.layers[name];
    }
    return true;
  }

  function dropdown(id, status)
  {
    if(!DHTML) return false;
    var element = new getObj(id);
    element.style.display = (status ? "block" : "none") ;
    return true;
  }

  function placeumenu(menuid, contentid)
  {
    if(!DHTML) return false;
    var elementa = new getObj(menuid);
    var elementb = new getObj(contentid);  
    if(!elementa.obj || !elementb.obj) return false;
    var heighta = 12 + elementa.obj.offsetHeight ;
    var heightb = 12 + elementb.obj.offsetHeight;
    elementb.style.top = heighta + 'px';
    elementa.style.height = heightb + heighta + 'px';
    return true;
  }

  function checkfile(id, file, doctype)
  {
    if(!DHTML) return false;
    var element = new getObj(id);
    if(file.indexOf(doctype) == -1)
      element.obj.innerHTML = '<img src="' + file + '" alt="" />';
    return true;
  }