function OpenNewWindow(URL,WindowName,Width,Height) {
	
	if(Height=="") {
		
		var Height="570";
	
	}
	
	if(Width=="") {
		
		var Width="600";
	
	}
	
	if(WindowName=="") {
		
		var WindowName="Jackpot";
		
	}
	
	if(URL=="") {
		
		var URL="http://www.jackpot.co.uk/popup-error.php";
		
	}

	var Top=(screen.width - Width) / 2;
	var Left=(screen.height - Height) / 2;
	
	var Parameters="width="+Width+", height="+Height+", top="+Top+", left="+Left+", toolbar=0, menubar=0, location=0, status=0, scrollbars=0, resizable=1";
	
	window.open(URL,WindowName,Parameters);
	
}