If you check out Freddy's profile (http://www.sitepointforums.com/member.php?action=getinfo&userid=7488) you can see what I mean.

In one of his posts he starts out:
you need to make the name of the select an array so fo your code:
<select name="format_type[]" size="3" multiple>
<option value="Compact Disc">Compact Disc
<option value="Cassette">Cassette
<option value="Vinyl">Vinyl</select>
Instead of running it through the "cleaner", it's spit out into the browser as a select box.