1.  
  2. <html>
  3. ...
  4. body onload="init();">
  5. <div id="LeftMarker"></div>
  6. <div id="TopMarker"></div>
  7. <div id="ThingToDrag">Drag me around!</div>
  8. <button id="Undo">Undo</button>
  9. </body>
  10. </html>
  11.  
  12.