form Post action

I have a strange Bug that only appears in Netscape 4.7* I have a set of user vaiables in a form in the menu frame, I copy these variables (using javascript) to another form in the main frame of the application, when I post this form I echo the name of the form input values. In all browsers the variables are displayed correctly except in Netscape 4.7* I if I look into the code of the generated page I see the following... <TITLE>Missing Post reply data</TITLE> <H1>Data Missing</H1> This document resulted from a POST operation and has expired from the cache. If you wish you can repost the form data to recreate the document by pressing the <b>reload</b> button. Reloading the frame doesn't work! I tried clearing the cache but doesn't help. Anyone any ideas? Thanks.