var xmlHttp
function unloadGame()
{ 

xmlHttp=GetXmlHttpObject_unload();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="_game.php";
url=url+"?xgame=jdfhgjfhdgkjfhdgkjhfdkghfdkgjhfdk";
url=url+"&sid="+Math.random();
xmlHttp.onreadystatechange=game_unloaded;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}

function game_unloaded() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("game_layer").innerHTML=xmlHttp.responseText;
var e = document.getElementById("game");
var x = document.getElementById("top_games");
e.style.visibility = 'hidden';
x.style.visibility = 'visible';
}
}

function GetXmlHttpObject_unload()
{
var xmlHttp=null;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
return xmlHttp;
}