title: jQueryUI tooltip jumps around
body: <p>When I repeatably scroll over an element the <a href="http://jqueryui.com/tooltip/">jQuery tooltip</a> seems to jump around. I thought maybe it was because it was colliding with itself, so I set the collision option to <code>none</code> but that didn't help.</p>
  
  <p>Is this a bug? How can I get it to not jump around?</p>