title: Overlay progress bar with jQuery
body: <p>I want to display a progress bar that "overlays" the page, disabling other actions while it's running, kind of like an alert (except you couldn't exit it by clicking anything).  What's a fast way to do this in jQuery?</p>
  
  <p>I already have the image picked out-- an animated progress bar.  Just need a way to properly overlay it.</p>