I have been looking at the following website

http://www.idexcorp.com/

I was wondering how they have got their Browse By Business section dropdowns to work by clicking the go button. I can't work out how to do this could someone help me please?

I currently have the following

Code:
<select name="newpage" class="quicksearch" onchange="document.location=this.value">
<option value="">Customer Service</option>
<option value="glossary.php">Glossary</option>
<option value="faq.php">FAQ</option>
<option value="privacypolicy.php">Privacy Policy</option>
<option value="termsandconditions.php">Terms &amp; Conditions</option>
<option value="trademarks.php">Trademarks</option>
<option value="sitemap.php">Sitemap</option>
<input type="submit" value="Go" class="submit-button" />
</select>
but want it so that a user can selct what they want and then click the submit button

Cheers