code: function jscoverage_beginLengthyOperation() {
    jscoverage_inLengthyOperation = true;
  
    var progressBar = document.getElementById('progressBar');
    progressBar.style.visibility = 'visible';
    ProgressBar.setPercentage(progressBar, 0);
    var progressLabel = document.getElementById('progressLabel');
    progressLabel.style.visibility = 'visible';
  
    /* blacklist buggy browsers */
  //#JSCOVERAGE_IF
    if (! /Opera|WebKit/.test(navigator.userAgent)) {
      /*
      Change the cursor style of each element.  Note that changing the class of the
      element (to one with a busy cursor) is buggy in IE.
      */
      var tabs = document.getElementById('tabs').getElementsByTagName('div');
      var i;
      for (i = 0; i < tabs.length; i++) {
        tabs.item(i).style.cursor = 'wait';
      }
    }
  }
docs: Indicates visually that a lengthy operation has begun.  The progress bar is
  displayed, and the cursor is changed to busy (on browsers which support this).