Why doesnt keydown work?
<p>This simple code doesnt work!   <a href="http://jsfiddle.net/FPcFn/" rel="nofollow">http://jsfiddle.net/FPcFn/</a></p>

<pre><code>$(document).keydown(function(e){

    switch (e.which){

        case 37: alert("37");
          }  

    });
</code></pre>

<p>Why? What could possibly go wrong?</p>
