var photorules = {
  'img.photo' : function(element) {
    element.onclick = function() {
      this.id.match(/photo(\d+)large/);
      var e = document.getElementById('photozoom');
      e.src=photophotoszoom[RegExp.$1];
      e.style.display='inline';

      centerInWindow(e);
    }
  },

  'img.cbphoto' : function(element) {
    element.onclick = function() {
      this.id.match(/photo(\d+)large/);
      var e = document.getElementById('photozoom');
      e.src=cbphotoszoom[RegExp.$1];
      e.style.display='inline';

      centerInWindow(e);
    }
  },

  'img.photozoom' : function(element) {
    element.onmouseout = function() {
      this.src='blank.gif';
      this.style.display='none';
    }
    element.onclick = function() {
      this.src='blank.gif';
      this.style.display='none';
    }
  }

}

Behaviour.register(photorules);