add: if( !(this.stack && this.stack.length) ) return this; 
context: 	end: function() {		return this.get( this.stack.pop() );	},
meta: 37	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/37/bda9ba1e1deef923b1fb6e0f180723606283167a/jquery-latest.js/clean/webapp/v2/js/jquery-latest.js