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if you do a search and replace on the source you can fix this:
change 'HTTP_GET_VARS' to '_GET'
change 'HTTP_POST_VARS' to '_POST'
change 'HTTP_SERVER_VARS' to '_SERVER'

the last one is causing your problem since the script needs to know what $_SERVER["PHP_SELF"] is. the older named arrays have been deprecated by default in php5.

cheers,
-zach