how to "extend" a .keydown() function?
<p>How can you "extend" or add more functionality to a .keydown()?</p>

<p>Lets say you already got this:</p>

<pre><code>input.keydown(function(){
alert('key pressed');
});
</code></pre>

<p>How can you then later on add one more alert()?</p>

<pre><code>alert('extra functionality');
</code></pre>
