function ads_forum()
{
 window.open ("http://forum.muzone.ro");
}

function ads1()
{
 window.open ("http://mu.top-site-list.com/vote3800.html");
}

function ads2()
{
 window.open ("http://www.xtremetop100.com/in.php?site=1132261338");
}

function ads3()
{
 window.open ("http://www.mmorpgtoplist.com/in.php?site=6720");
}

function ads4()
{
 window.open ("http://www.gamesites100.net/in.php?site=9624");
}

function ads_random()
{

 n = Math.floor((10-3)*Math.random());

switch(n)
{
case 1:
  ads1();
  break;    
case 2:
  ads2();
  break;
case 3:
  ads3();
  break;
case 4:
  ads4();
  break;
default:
  ads_forum();
}

}