Create a dropdown list in vBulletin

I got a question. On my forum I've added a small code to show members computer information in the postbit_legacy template.

Using this code:

Code:

<if condition="$post['field6'] == '1'">	
<b>My Computer</b><br>
</if>
<if condition="$post['field7'] AND $post['field6'] == '1'">
	CPU: $post[field7]<br>
</if>
<if condition="$post['field8'] AND $post['field6'] == '1'">
	GFX: $post[field8]<br>
</if>
<if condition="$post['field9'] AND $post['field6'] == '1'">
	RAM: $post[field9]<br>
</if>
<if condition="$post['field10'] AND $post['field6'] == '1'">
	HDD: $post[field10]<br>
</if>
<if condition="$post['field11'] AND $post['field6'] == '1'">
	Mobo: $post[field11]<br>
</if>
<if condition="$post['field12'] AND $post['field6'] == '1'">
	OS: $post[field12]<br>
</if>
<if condition="$post['field13'] AND $post['field6'] == '1'">
	Sound: $post[field13]
</if>

Now my question: how can I modify the code, so the computer information is hidden inside a dropdown menu that can be expanded (like on HWF)?