Ack! <select> not showing up in search drop down box!

[kaosmoon]

I already posted this at vb.com, and was told to try here.

I've been attempting this forever and it is driving me nuts. I am trying to implement a simple <select> drop down box on top of the search drop down box, right under the current <input> box. I added a section to my forum that I want to be able to search so I added a select box inside of the search DHTML drop down box thing. However, it only appears in Mozilla. In IE, there is just an empty space there. Actually, a few people tell me it works, and others tell me it doesn't work. Any ideas as to what would cause that? I am going nuts.

This is the code which is placed right after the <tr> for the regular search:

<tr>
			<td class="thead">Search ICIX Nation</td>
		</tr>
		<tr>
			<td class="vbmenu_option" title="nohilite">
			<form action="icixnation2.php?do=search" method="post" name="icix_search" onsubmit="filledin()">
				<input type="hidden" name="do" value="process" />
				<input type="hidden" name="showposts" value="0" />
				<select name="icixcategory" style="width: 180px;">
					<optgroup label="Stereo Related">
					<option value="source">Source Unit</option>
					<option value="speaker">Speaker(s)</option>
					<option value="spamp">Speaker Amplifier(s)</option>
					<option value="sub">Subwoofer(s)</option>
					<option value="subamp">Subwoofer Amplifier(s)</option>
					<option value="tweeter">Tweeter(s)</option>
					<option value="twamp">Tweeter Amplifier(s)</option>
					<option value="wire">Wiring</option>
					</optgroup>
					<optgroup label="Vehicle Related">
					<option value="vehicle_brand">Make</option>
					<option value="vehicle_model">Model</option>
					</optgroup>
					<optgroup label="Location Related">
					<option value="city">City</option>
					<option value="state">State</option>
					</optgroup>
				</select>
				<br />
				<input type="text" class="bginput" name="icixquery" size="20" />
				<input type="submit" class="button" value="Go"  />
			</form>
			</td>
		</tr>

I know HTML fairly decently, so I was thinking it had something to do with just plain having a select box on the DHTML menu with IE. Maybe it parses it differently?

BTW - I also tried a simple <select><option>test</option></select>. Still no go.

[kaosmoon]

Anyone?