function initChat(){
		var nick = document.getElementById("username");
	    if(nick.value == "")  {
		alert("Please enter a Nickname!");
	return false;
	}
	   	else if(nick.value != ""){
			chatupform(nick.value);
		}

	}

	function chatupform() {
		var url = "chat/index.php"
		var width = 660; 
		var height = 430;
		var screenX = (screen.width/2 - width/2);
		var screenY = (screen.height/2 - height/2);
		var features= "width=" + width + ",height=" + height;
		features += ",screenX=" + screenX + ",left=" + screenX;
		features += ",screenY=" + screenY  +",top=" + screenY+", scrollbars=0";
		var mywin=window.open(url, "chat", features);
	mywin.focus();

	}