function LiveNodeList(node,refresh){
	this._node = node;
	this._refresh = refresh
	_updateLiveList(this);
}
Returns the indexth item in the collection. If index is greater than or equal to the number of nodes in the list, this returns null.
@standard level1
@param index  unsigned long 
  Index into the collection.
@return Node
	The node at the indexth position in the NodeList, or null if that is not a valid index.