$(document).ready(function() {
      var works = {};
      works.init = function(){
          works.imgHolder = $("#work_photo_holder")[0];
          var buttons = $(".work_slideshow_button");
          for (var i = 0; i < buttons.length; i ++){
              var bt = buttons[i];
              bt.onclick = works.changePhoto;
              var linkA = $("a", bt)[0];
              linkA.href = null;
          }
      }
      
      works.changePhoto = function(){
          var url_p = $("p", this)[0];
          var newURL = url_p.innerHTML
          works.imgHolder.src = newURL;
          if (works.currentPhotoLink) works.disableButton(works.currentPhotoLink);
          var cur = works.currentPhotoLink = $(this);
          works.enableButton(cur);
          return false;
      }
      
      works.enableButton = function(item){
          item.onclick = works.changePhoto;
          item.addClass("photo_open");
      }
      
      works.disableButton = function(item){
          if(!item) return;
          item.onclick = null;    
          item.removeClass("photo_open")
      }
      
      works.init();
 });