function error(message)
{
	setTimeout("alert('" + message + "');", 100);	
}


function popup(url, width, height, scrollbars)
{
	var x = (screen.width / 2) - (width / 2);
	var y = (screen.height / 2) - (height / 2);
	var attributes = "toolbar=0, location=0, directories=0, status=0, menubar=0, scrollbars=" + scrollbars + ", resizable=0, width=" + width + ", height=" + height + ", top=" + y + ", left=" + x;

	var popup;

	popup = window.open(url, Math.random(), attributes);
	
	if (popup == null)
	{
		alert('Please turn of your popup blocker.');
		return;	
	}

	popup.focus();
}