I just signed up for the Atomz search service.

I want to be able to get rid of the square gray "search" button, and instead use a graphic to submit search queries.
I'm including the code below.

<!-- Atomz.com Search HTML for Electrofiction -->
<form method="get" action="http://search.atomz.com/search/">
<input size=15 name="sp-q"><br>
<input type=submit value="Search">
<input type=hidden name="sp-a" value="000a0c15-sp00000000">

Any help is appreciated. Thanks