This appears to be related to a cgi-script, right? Are you using the CGI module to fetch the parameter values from the form? I have seen people trying to read the parameters in themselves (without CGI.pm) and getting bitten by URI escape sequences in their input. Without seeing your code... this would be my first guess.
They say that time changes things, but you actually have to change them yourself.
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Want more info? How to link or
or How to display code and escape characters
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