Il tuo script restituisce questi warning:

Warning: imagegif() [function.imagegif]: Unable to open '../public/archivio/brandonc_1_04_12_2008.gif' for writing in D:\Inetpub\webs\livellozeroit\dati\100\diploma.php on line 28

Warning: imagegif() [function.imagegif]: Unable to open temporary file in D:\Inetpub\webs\livellozeroit\dati\100\diploma.php on line 30
Controlla i privilegi di scrittura del file '../public/archivio/brandonc_1_04_12_2008.gif'