[Lynne]

Hmmm, not as straightforward as I thought. Here is the line in the postbit template:

<if condition="$show['avatar']"><td class="alt2"><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="$post[avatarurl]" $post[avwidth] $post[avheight] alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a></td></if>

You would have to write a plugin, I think that would basically say if $post[avwidth] or $post[avheight] is greater than whatever-size-you-want, then to set it to whatever-size-you-want. Like, if you want it no bigger than 100, write a plugin that says if either of those two vars are greater than 100, set them to 100. It could result in an strange looking avatar (like if it was 200 x 100 and you set it to 100 x 100), but it would keep the appearance how you like it. Another way might be to use css to say the overflow is hidden. I think you could put a div around it with that sort of css and then any part of the avatar that is great than your size, would just be cut-off.