When you hit your browser's Back button does it ask you if you want to 
repost form data?
Is this going to be on multiple computers or just one?  If only one then 
upgrade the browser to 6.0.  It works on that version.  5.0 is at least 
3 years old and I can't be sure that it will do what you want.  A better 
  solution might be to install Mozilla 1.4.  It will definitely perform 
as expected.

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I refrained from telling him that I doubted they could find their ass 
with an electronic ass finder.