It has been a while since I've done that but I think when you put the "multiple" option on a select box, you will receive an array of values on the other side. Try a print Dumper of the CGI params and you should be able to find the selected value(s).
I think you would be able to do this:
my @names = $cgi->param('name_of_select_box');
If $cgi is a CGI object. But try the Dumper first to make sure.
Testing never proves the absence of faults, it only shows their presence.
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