[Xenon]

well you can use a little trick:
open admin/functions.php

find:

PHP Code:

                $post[signature]=bbcodeparse($post[signature],0,$allowsmilies);
                eval("\$post[signature] = \"".gettemplate("postbit_signature")."\";");
                $sigcache["$post[userid]"] = $post[signature]; 


change it to:

PHP Code:

                $post[signature]="<img src=\"".bbcodeparse($post[signature],0,$allowsmilies)."\">;
                eval("\$post[signature] = \"".gettemplate("postbit_signature")."\";");
                $sigcache["$post[userid]"] = $post[signature]; 


then tell your users they have to enter just the url of their pic into the sig...