print popup_menu(-name    => 'foo',
                 -values  => \@quantities,
                 -labels  => \%labels,
                 -default => 25);

##</code><code>##

<select name="foo" >
<option value="1">Individual</option>
<option value="5">5</option>
<option value="10">10</option>
<option selected="selected" value="25">25</option>
<option value="50">50</option>
<option value="100">100</option>
</select>