change useragent

NSDictionary*dictionary =[NSDictionary 
        dictionaryWithObjectsAndKeys:@"Mozilla/5.0 (iPod; U; CPU iPhone OS 4_3_3 like Mac OS X; ja-jp) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5",@"UserAgent", nil];[[NSUserDefaults standardUserDefaults] registerDefaults:dictionary];