title: How to add a YUI keyup listener
body: <p>How do I add a YUI keyup listener? This is very simple with jQuery but I don't understand how to do it with YUI. There appears to be a YAHOO.util.KeyListener but it looks like that only listens for specific keys. I also tried to use YAHOO.util.Event.addListener but I couldn't get it to work with keyup. I'm not sure if addListener can use a keyup event since the YUI documentation is god awful. </p>
  
  <p>Is there a way to create a listener for a key up even using YUI (aka the satanic framework)?</p>