I've been looking for something like this forever. Such a hack would be welcome on our forums, as we have a lot of members who tend to add too large images, and it's just a pain for our moderators to keep up with them all.
I did manage to fix the width issue by adding the overflow attribute into a div that displays the signature ::
<div style="width: 500px; overflow: hidden">$signature</div>
But that won't work for the length [which is now our biggest issue] because the div is a fixed amount, so adding a height would cause large gaps under user signatures that are small.
I saw it once on an Invisionfree board where it used javascript, but their example never worked. And my javascript knowledge is very limited to try to do it myself. I too hope that someone out there is interested in taking on this idea.
Abe Babe...
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