why isn't my dropdown being selected?!

<select name="increments">
<option <? if($increment=="0"){'selected';}?> value="0">00:00</option>
<option <? if($increment=="30"){'selected';}?> value="30">00:30</option>
<option <? if($increment=="60"){'selected';}?> value="60">01:00</option>
<option <? if($increment=="90"){'selected';}?> value="90">01:30</option>
<option <? if($increment=="120"){'selected';}?> value="120">02:00</option>
</select>

What is the value of $increment?

What is the HTML code that is generated and sent to the browser (can you post it here, please)?

Also.... you're not echoing 'selected'... its just sitting there. It needs to be echo'ed out.