Sorry, but i have a little problem.. ( Again!

)
I made a subtitle button (Image) and a subtitle static control(Text) in a option.window..
When click on button my static control change name: "Off" and when click again change to "On"...
Now, i want a code to save my option ("On/Off") in my registry game and to change the subtitles options ("Game.Subtitles=true" or "Game.Subtitles=false")..
Somebody help me!!!
thankssssssssssssssssssssssssssss!!!