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mrj / Center the clicked position on click-to-zoom images

// ==UserScript==
// @name        Center the clicked position on click-to-zoom images
// @description If a picture changes size when it's clicked, the point on the image that was clicked is scrolled as close as possible to the centre of the window.
// @include     *
// @version     2
// ==/UserScript==
document.addEventListener('click', function (event) {
  var i = event.target;
  if (i.tagName == 'IMG') {
    var op = i.getBoundingClientRect();
    setTimeout( function () {
      var np = i.getBoundingClientRect();
      if (np.height != op.height || np.width != op.width) {
        window.scrollBy((event.clientX-op.left)/op.width*np.width+np.left-innerWidth/2,
                        (event.clientY-op.top)/op.height*np.height+np.top-innerHeight/2);
      }
    }, 100);
  }
}, true);