It was the smilies that were causing the problem.
Upload them to the forums ./images/smilies folder instead of linking to an external site.
Pretty simple fix then. I didn't even think to check that, so cheers AJ
Aha, ok. Thanks, man I was literally just telling Euan that it was the smilies. I was so proud I found something out that was causing a problem with something technical. I'm a newbie to this kind of stuff.
Thanks again guys.