title: Dragging a Div in jQuery - fine when mouse is slow, but fails on fast mouse movement
body: <p>I want to drag a div around using my own jQuery code.</p>
  
  <p>This example on jsfiddle works fine when the mouse movements are slow</p>
  
  <p><a href="http://jsfiddle.net/craic/kr7Un/">http://jsfiddle.net/craic/kr7Un/</a></p>
  
  <p>But any fast movement pulls the mouse out of the box and the tracking is lost.</p>
  
  <p>jQuery UI draggable doesn't have this problem and tracks just fine regardless of how fast you move: <a href="http://jqueryui.com/demos/draggable/">http://jqueryui.com/demos/draggable/</a></p>
  
  <p>But I want to roll my own simple version so that I can integrate it with Raphael, key presses, etc. I've looked at the jQuery UI draggable source but it is, for me, pretty impenetrable (800 lines).</p>
  
  <p>I don't think it is an issue with event bubbling... any ideas?</p>