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if ( [[[UIDevice currentDevice] systemVersion] floatValue] >= 5.0 )
   NSLog (@"iOS version is greater than 5.0");

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//dim the screen base on a slider value

[[UIScreen mainScreen] setBrightness:[(UISlider *)sender value]/100];

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 //--Touch to dismiss keyboard
		UIButton *dismissKeyboardButtonBg = [UIButton buttonWithType:UIButtonTypeCustom];
		dismissKeyboardButtonBg.backgroundColor = [UIColor clearColor];
		[dismissKeyboardButtonBg addTarget:self action:@selector(dismissKeyboard:) forControlEvents:UIControlEventTouchUpInside];
		[dismissKeyboardButtonBg setFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
		[dismissKeyboardButtonBg setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
		[self.view addSubview:dismissKeyboardButtonBg];