[% USE bc = BioChrome("$image_src/button.gif");
   colors = ['00' '33' '66' '99' 'CC' 'FF']
%]
<table border="0">
[% FOREACH row IN colors %]
<tr>
        [%- FOREACH col IN colors;
                hexcol = "${row}00${col}";
                bc.alphas("ffffff_${hexcol}_ffffff_000000");
                bc.write_file("$image_dest/button${hexcol}.gif")
        -%]
        <td>
                <img src="[% images %]/button${hexcol}.gif" />
        </td>
        [% END %]
</tr>
[% END %]
</table>