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   1  /**
   2   * @param {Window} w The global window object.
   3   * @output wp-includes/js/wp-list-revisions.js
   4   */
   5  
   6  (function(w) {
   7      var init = function() {
   8          var pr = document.getElementById('post-revisions'),
   9          inputs = pr ? pr.getElementsByTagName('input') : [];
  10          pr.onclick = function() {
  11              var i, checkCount = 0, side;
  12              for ( i = 0; i < inputs.length; i++ ) {
  13                  checkCount += inputs[i].checked ? 1 : 0;
  14                  side = inputs[i].getAttribute('name');
  15                  if ( ! inputs[i].checked &&
  16                  ( 'left' == side && 1 > checkCount || 'right' == side && 1 < checkCount && ( ! inputs[i-1] || ! inputs[i-1].checked ) ) &&
  17                  ! ( inputs[i+1] && inputs[i+1].checked && 'right' == inputs[i+1].getAttribute('name') ) )
  18                      inputs[i].style.visibility = 'hidden';
  19                  else if ( 'left' == side || 'right' == side )
  20                      inputs[i].style.visibility = 'visible';
  21              }
  22          };
  23          pr.onclick();
  24      };
  25      if ( w && w.addEventListener )
  26          w.addEventListener('load', init, false);
  27      else if ( w && w.attachEvent )
  28          w.attachEvent('onload', init);
  29  })(window);