Off the top of my head :

use strict on? use warnings /-w switch on? These usually help you located the "uninitialized value".

This error basically means you have assigned a variable and are trying to pass it through a CGI.pm function. The error is being thrown at you because it's saying "Hey! $variable is empty buddy! What are you trying to pull?". When you find the variable that isn't being assigned, use some debugging methods (like a whole bunch of print "Variable is here : $variable\n" to track down the problem...

Update : If you still have no luck, post your code here. Use code tags, and also use ReadMore tags. Check out Writeup Formatting Tips for explanations...

Azatoth a.k.a Captain Whiplash