Event.addBehavior({
  '#sidebar ul li a:click' : function(e) {
    var newLink = this.href;
    if (newLink) {
      // update content of #photo div with new image
      new Ajax.Updater({success:'photo'}, newLink + '&bImageOnly=1');

      // update link on the plus image / link to view larger image
      var linkParams = newLink.toQueryParams();
      var newImageId = linkParams['iImageID'];
      
      var largeLink = $('largelink').down('a');
      largeLink.onclick = function() {
        openWindow('popup_large.asp?iImageID='+newImageId, 'popup', 300, 300); return false;
        return false;
      }
    }
    return false;
  }
});