code: function(fn, includeSelf) {
  			var i,
  				l,
  				n,
  				ac = this.parent.children;
  
  			for (i = 0, l = ac.length; i < l; i++) {
  				n = ac[i];
  				if (includeSelf || n !== this) {
  					if (fn(n) === false) {
  						return false;
  					}
  				}
  			}
  			return true;
  		}
docs: Call fn(node) for all sibling nodes.<br>
  Stop iteration, if fn() returns false.<br>
  Return false if iteration was stopped.
  
  @param {function} fn the callback function.
  Return false to stop iteration.
  @param {boolean} [includeSelf=false]
  @returns {boolean}