<div id="test_css">
<form action="./" method="get">
<p class="plugin-search" &align>
<input type="text" size="20" name="q" value="" maxlength="200" /><br />
<input type="submit" value=" 検索 " /><br />
<input type="image" src="画像URL" alt="検索">
</p>
</form>
</div>