function launchChat() 

{ 

var xOffSet = (screen.width - 225) / 2;

var yOffSet = (screen.height - 500) / 2;

var features = 'width=600,height=488,toolbar=0,directories=0,menubar=0,status=0,location=0,scrollbars=0,resizable=0';

var winName = 'v3chatrooms';

var chatUrl = 'http://'+location.hostname+'/hallen/v3chatrooms/index.php?uid='+userID+'&uname='+userName;

myWin = window.open(chatUrl,winName,features);

}