calling a command with combined strings from drop down box

[liunx]

I would like to be able to use drop down boxes and take the values assigned by them to construct a character string to input into the form action code. This doesn't necessarily need to be done even remotely similar to the way i have started it... i assume that the gist of what i am attempting is understood and i'll do it anyway possible. <br />
<br />
Example code: <br />
<br />
<form method="post" action="<!--#ystore_order id="ITEM_ID_GOES_HERE" -->"> <br />
<br />
<p> <br />
<br />
<select size="1" name="APP"> <br />
<br />
<option value="21-402">90-93 Acura Integra All</option> <br />
<br />
<option value="21-401">94-01 Acura Integra Non VTEC</option> <br />
<br />
</select> <br />
<br />
<br />
<br />
<select size="1" name="COLOR"> <br />
<br />
<option value="b">Blue</option> <br />
<br />
<option value="r">Red</option> <br />
<br />
<option value="c">Clear</option> <br />
<br />
<option value="p">Polished</option> <br />
<br />
</select> <br />
<br />
<br />
<input type="submit" value="Order"> <br />
<br />
</p> <br />
<br />
</form> <br />
<br />
<br />
So ideally I want the user to be able to select ?0-93 Acura Integra All?then 鎻僱ue鏀