This is also next to my forum name. IE7. Skin is the blue/grey one, not the black one. In looking at the source that is being sent to the browser, we see:
<td class="alt2"><a href="member.php?u=1480"><img src="image.php?u=1480&dateline=1212685885" width="59" height="65" alt="XSiveMaximus's Avatar" border="0" /></a></td>
My guess is that it is the single quote (') character in (alt=) portion of the above string that is causing the problem, since the browser can interpret the HTML tags that use the double quote and also single quote characters. Thus the browser thinks the image tag attribute "alt" is closed at the single quote location of the string?
I would modify the PHP to create the alt attribute to say, "Avatar of XSiveMaximus" instead of "XSiveMaximus's Avatar" .