Does anyone know of a function that assists with checking URL  
strings to make sure they haven't been monkeyed with?

Ideally something that calculates the md5 hash of a string and then 
automatically verifies it when a user clicks a link.

I've checked the usual places (hotscripts, devshed, etc) and didn't see 
anything, but I wanted to check with the group before rolling my own.

Thanks.

--kurt

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