function menu_hide_submenus(menuname)
{
  if(openmenus)
  {
    var h = false;
    var c = 0;
    for(var i in openmenus) 
    {
      if(h)
      {  
        var m = document.getElementById(openmenus[i]);
        m.style.visibility = "hidden";
      }
      else if(openmenus[i] == menuname)
      {
        h = true;
      }
      else
      {
        c++;
      }
    }
    openmenus.length = c+1;
  }
}