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are you referring to the directory script here: [site-directory.org...]
but with my own customized add to site page?
if you use that script some people they have had security issues with it. I do not know what the problem exactly was, but I would recommend deleting the category uninstall and directory uninstall pages from your server if you use that script.
many other directories use that script and do not modify it much. if you use it make sure your copy looks original.
I also would recommend staying away from using a DMOZ clone.