you need to find where ever the gif images are defined and then change the code. It will probably look something like...
<a href="newthread.php?$session[sessionurl]do=newthread&f=$foruminfo[forumid]" rel="nofollow"><img src="$stylevar[imgdir_button]/newthread.gif" alt="$vbphrase[post_new_thread]" border="0" /></a>
the "newthread.gif" would need to be changed to newthread.png for each icon. I would probably do "Search in Templates" from the admin cp and put in "imagename.gif" so you can see all the templates that need to be changed, and then edit each template.
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