function ShowMenu(oNumber)
{
   if (!document.getElementById)
      return;
   document.getElementById("submenu_" + oNumber).style.visibility="visible";
}

function HideAll()
{
   if (!document.getElementById)
      return;
   document.getElementById("submenu_1").style.visibility="hidden";
   document.getElementById("submenu_2").style.visibility="hidden";
   document.getElementById("submenu_3").style.visibility="hidden";
   document.getElementById("submenu_4").style.visibility="hidden";
   document.getElementById("submenu_5").style.visibility="hidden";
}