code: function(node) {
              node = Y.Dom.get(node);
              if (!node) {
                  return null;
              }
  
              return Y.Dom.getPreviousSiblingBy(node);
          }
docs: Returns the previous sibling that is an HTMLElement
  @method getPreviousSibling
  @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point
  @return {Object} HTMLElement or null if not found