this.append(str); 
if(str){ this.append(str); } 
	dojox.string.Builder = function(/*String?*/str){		// summary:		//		A fast buffer for creating large strings		// str: The initial string to seed the buffer with		this.b = dojo.isIE ? [] : "";		this.append(str);	};
5168	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5168/dbc683e613bd4f2b28d1222c20c3f6b165d88a86/string.js/buggy/string.js