code: function(selector) {
  
  	if( typeof selector == 'string' ) {
  		var node = document.querySelectorAll(selector);
  
  		if( node.length == 0 ) {
  			return null;
  		}
  
  		return new NWTNodeInstance(node[0]);
  	} else {
  		return new NWTNodeInstance(selector);
  	}
  }
docs: Returns a NWTNodeInstance class
  @constructor