[xikkub]

Thanks muukis. That fixed it for me. The only problem now is that I get this message when I load the chatlogex.php page.

Notice: Undefined index: mark in C:\wamp\www\cssource\chatlogex.php on line 85

Line 85 happens to be this:
if ($mark = $_GET['mark'] + 0):

Apart from that, everything works fine. The chat display is smooth and operational, but that php error scares me.