Search box function

Hi

My theme has a search box that activates the search function by hitting return.

I would also to like it to work by clicking on the button that is incorporated into the search box.

Here on my unfinished site:

http://www.clenz.co.uk

Is this possible?

Here is my code. Thanks in advance for any answers.

<h2>Search</h2>
<form id=”searchform” method=”get” action=”<?php bloginfo(‘home’); ?>/”> <input type=”text” value=”search this site…” onfocus=”if (this.value == ‘search this site…’) {this.value = ”;}” onblur=”if (this.value == ”) {this.value = ‘search this site…’;}” size=”18″ maxlength=”50″ name=”s” id=”s” /> </form>