Yeah i've got the same on my site (but i renamed it ranges - but it's still the manufacturer)
http://www.justhom.com
this is the code that i've got in
modules/Manufacturers/menu_manufacturers.tpl
Code:
<form name="form_manuf" method="get" action="manufacturers.php" style="margin-bottom:0;">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="90%" align="right" valign="middle">[img]{$ImagesDir}/3reddots.gif[/img]</td>
<td width="0" align="right"><select name="manufacturerid" onChange="document.form_manuf.submit()">
<option value="0" selected>Choose a Range</option>
{section name=mid loop=$manufacturers_menu}
<option value="{$manufacturers_menu[mid].manufacturerid}" {if $manufacturerid==$manufacturers_menu[mid].manufacturerid} selected {/if}>{$manufacturers_menu[mid].manufacturer}</option>
{/section}
</select> </td>
</tr>
</table>
</form>