Dropdown search box doesn't work

[lightnb]

I'm trying to get a custom search button to create a dropdown box, like the search button on the navbar does. Right now, all it's doing is linking to the main search page. I'm using this code:

<a href="search.php$session[sessionurl_q]" accesskey="4" rel="nofollow" onMouseOver="MM_nbGroup('over','search','http://www.rahlentertainment.com/livexchange/forums/images/trapazoid/subnav_buttons/search_over.gif','',1)" onMouseOut="MM_nbGroup('out')"><img src="http://www.rahlentertainment.com/livexchange/forums/images/trapazoid/subnav_buttons/search.gif" alt="Search" width="79" height="25" border="0"></a><script type="text/javascript"> vbmenu_register("navbar_search"); </script>



	<!-- header quick search form -->
	<div class="vbmenu_popup" id="navbar_search_menu" style="display:none">
		<table cellpadding="4" cellspacing="1" border="0">
		<tr>
			<td class="thead">$vbphrase[search_forums]</td>
		</tr>
		<tr>
			<td class="vbmenu_option" title="nohilite">
			<form action="search.php" method="post">
				<input type="hidden" name="do" value="process" />
				<input type="hidden" name="showposts" value="0" />
				<input type="hidden" name="quicksearch" value="1" />
				<input type="hidden" name="s" value="$session[sessionhash]" />
				<input type="text" class="bginput" name="query" size="20" />&nbsp;$gobutton<br />
			</form>
			</td>
		</tr>
		<tr>
			<td class="vbmenu_option"><a href="search.php$session[sessionurl_q]" accesskey="4" rel="nofollow">$vbphrase[advanced_search]</a></td>
		</tr>
		</table>
	</div>
	<!-- / header quick search form -->