Converting to GIF and removing the animation

I have a forum where you are able to upload avatar images in
several  
formats. The avatars are then all converted to GIF but
people are  
still able to upload animated GIF which I would like to
avoid.

How can I convert a graphics file to GIF and make sure the
animation  
part is removed?

Palle

--
Venlig hilsen
Palle B. Nielsen (PowerPalle)
http://www.macnyt.dk/
iChat: powerpalle

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