limit number messages listed per page

hi

i wish to limit the number of messages listed per page to 100 or lesser

i wish to edit the squirrelmail source for the same and would like to use
java script popup kind of limiting

could you pl guide me as to which page would need to be edited for this

i checked out and found part of the information
/include/options/display.php

what i need to know is where to edit the text input box

rajesh









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