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<form>
<select name="month" size="1">
...
</select>
<input type="submit">
</form>

my $month = $cgi->param('month');
# You are using CGI or CGI::Simple, are you not?

# now do whatever you want with that $month

# here is one of the million ugly ways of doing this. 
# The better way would be to use a templating system.
...
  $form .= "</select>\n";
  return $form;
}