Since you want to achieve this without clicking submit you'd need to use JavaScript to generate the other list(s) for further selection. If you want a dynamic database driven list think of an AJAX call to a perl script which returns a list of elements matching the criteria.

Update: For AJAX stuff I use the jQuery framework.

In reply to Re: Can Perl CGI do it? by marto
in thread Can Perl do it? by lightoverhead

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