Don't overwrite in <div> but add to <div>
<p>I have made a script which shows content in a &lt; div > when you push a button, but when i push another button (while there is already content in the &lt; div >) it overwrites the content. So only the new content shows and the old content disapears. </p>

<pre><code>function HandleResponse(response)
{
   document.getElementById('test123').innerHTML = response;
}
</code></pre>

<p>So the question is: How can I ADD content to a &lt; div > instead of overwriting the content in the &lt; div >? This way I can show multiple content in one &lt; div >.</p>
