title: Arrow Keys reading as '0' in keypress event handler
body: <p>Debugging with Firebug in Firefox 8.0.1, I attach a <code>keypress</code> event handler to an editable div. Every key press shows correctly in the console except the arrow keys, for which <code>e.which</code> in the console is showing up as 0.</p>
  
  <p>How can I get the keycodes for the up and down arrow keys?</p>