<div class="Search">
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<input type="text" name="s" class="keyword" />
<div id="buttonsearch"><input name="submit" type="image" class="search" title="Search" src="<?php bloginfo('template_url'); ?>/images/ButtonTransparent.png" alt="Search" />
</div>