CopyCat,
I tryed your and Marks idea.
Made an Image directory in my cgi directory and put CGI.pm and Size.pm in there with #!/usr/bin/perl/Image and chmod them to 755
This give me a blank screen when i try to upload.
I tryed the another idea:
I place Size.pm and CGI.pm in my cgi directory chmod them to 755 and require the bolth files in the uploadavatar.pl.
This also give me a blank page when i try to upload a avatar.
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I got also UBB hacks database