function is_defined (Variable)
{
  return eval("typeof("+Variable+")!=\"undefined\"");
}
MenuActive=0;
function Menu_MouseOver (MenuId, Color)
{
  var Obj;

  Obj=document.getElementById(MenuId+"sub").style.visibility="visible";
  //alert (Obj.classname);
  document.getElementById(MenuId).style.backgroundColor=Color;
  MenuActive|=0x1;
  //alert (MenuActive);
}
function Menu_MouseOut (MenuId, Color)
{
  MenuActive&=(0x3-0x1);
  //alert (MenuActive);
  if (MenuActive==0)
    {
    document.getElementById(MenuId+"sub").style.visibility="hidden";
    document.getElementById(MenuId).style.backgroundColor=Color;
    }
}
function Submenu_MouseOver (MenuId, Color)
{
  var Obj;

  Obj=document.getElementById(MenuId+"sub").style.visibility="visible";
  document.getElementById(MenuId).style.backgroundColor=Color;
  MenuActive|=0x2;
  //alert (MenuActive);
}
function Submenu_MouseOut (MenuId, Color)
{
  MenuActive&=(0x3-0x2);
  //alert (MenuActive);
  if (MenuActive==0)
    {
    document.getElementById(MenuId+"sub").style.visibility='hidden';
    document.getElementById(MenuId).style.backgroundColor=Color;
    }
}