var s = "undefined";
var old_id = "";


function show(id)
{
//  alert(this.old_id + ' - ' + id);
  if(this.old_id == id)
    clearhidemenu();
  else if(this.old_id != "")
  {
//    alert('Wpo');
    clearTimeout(this.s);
    y = document.getElementById(this.old_id);
    y.style.visibility = 'hidden';
    this.old_id = id;
  }else
    this.old_id = id;
  x = document.getElementById(id);
//  if(x.style.visibility == 'visible')
//    x.style.visibility = 'hidden';
//  else
  x.style.visibility = 'visible';
}

function hide(id)
{
  x = document.getElementById(id);
  this.s = setTimeout("x.style.visibility = 'hidden'",200);
}

function clearhidemenu()
{
   if(this.s != "undefined")
     clearTimeout(this.s);
}