code: function(el) {
              var id = el.id;
  
              if (!id) {
                  id = Y.stamp(el);
                  el.id = id;
              }
  
              return id;
          }
docs: Generates an unique ID for the element if it does not already
  have one.
  @method generateId
  @param el the element to create the id for
  @return {string} the resulting id of the element
  @static