At this point, it sounds like you need help designing some HTML and/or JavaScript to provide this type of functionality. Which really has nothing to do with Perl.

And, of course, that's probably not entirely true - you're probably writing all the CGI in perl. And there may be modules on CPAN that produce the javascript you want.

(Anyone else ever think that PM should have a section labelled "Seekers of Perl/CGI Wisdom"? Perl/HTML/JavaScript can be so intertwined, as is evidenced by all the modules on CPAN dealing with producing HTML, and the few that deal with producing Javascript...)

Anyway - until there is such a section, you might be best off if you look for Javascript-oriented forums on other sites. Unfortunately, I'm not into JS, so I'm not a resource for that. Google probably is, though.