title: Difference between onMouseOver and onMouseEnter
body: <p>I'm trying to have a simple html table, that highlights a row as a user mouses over it.  Unfortunately the css hover item doesn't work for IE.  That leaves me to simulate it in Javascript. I can use either <code>onmouseenter</code> or <code>onmouseover</code>.</p>
  
  <p>What is the difference between them, and which one should I use?</p>