If I understand the problem correctly what you are trying
to do is when the submit button is hit is to find the filenames
of the files that have been checked
In the following piece of code, when the submit button is hit
the array @files will contain the names of the files checked and the
string 'submit'

#!/usr/bin/perl -w
use CGI;

$page = new CGI;
print $page->header();

print $page->start_html();

if ($page->param('submit'))
{
    @files = grep {defined CGI::param($_) or CGI::param($_) ne ''} CGI
+::param();
    print @files;
    exit;
}
print $page->startform();

@latest = qw(one two three);
foreach $fname(@latest)
{
    print qq($fname <input type='checkbox' name='$fname' value='$fname
+'>);
    print qq(<br>\n);
}
print qq(<input type='submit' name='submit' value='Submit');
print $page->endform();
print $page->end_html();
[download]

Hope this helps