function enableDropdownMenu()
{ if (document.all)
  { uls = document.getElementsByTagName('UL');
    for(i = 0; i < uls.length; i++)
    {  if (uls[i].className == 'dropdown')
       { var lis = uls[i].getElementsByTagName('li');
         for (j = 0; j < lis.length; j++)
         { if(lis[j].lastChild.tagName == 'UL')
           { lis[j].onmouseover = function() { this.lastChild.style.display = 'block'; }
             lis[j].onmouseout = function() { this.lastChild.style.display = 'none'; }
            }
          }
        }
    }
  }
}