onSubmit javascript form event swap out image?
<p>I have the following input button code.  How do I alter this code to use a greyed out version of the button called <code>btn_nxt.png_hold.gif</code> once the submit occurs?</p>

<pre><code>&lt;input onsubmit="this.disabled=true;return true;" type="image" name="Insert" id="Insert" value="Insert" alt="Insert" src="images/btn_nxt.png"  /&gt;
</code></pre>
