title: Dojo "loading"-message
body: <p>I'm new to Dojo, so I need a little help.</p>
  
  <p>Some of my links takes a while (when the user clicks, it takes several seconds before the page starts loading), and I'd like to add a "loading"-message.</p>
  
  <p>I can do it the "old fashion way", but I want to learn the new, easier, smarter Dojo-way.</p>
  
  <p>Exactly how it works is not important right now, but I imagine something like this:</p>
  
  <p>A rectangle appears in the middle of the browser-windows. (Not the middle of the document.) It has an animated gif, and a message like "Please wait...".</p>
  
  <p>All other elements are disabled, maybe "faded out" a bit. Maybe a big white 50% transparent rectangle, which sits between the "loading"-message and the rest of the document.</p>