How to make a slide bar that controls opacity

I'm trying to figure out how to make a slide bar that would control opacity. If I were to take to pictures on top of each other, the slide bar would control the opasity of the top image. Thanks

can you make a slider that controls anything?  if so, what's the range you can control?
ie, when the slider is at one extreme it causes some object to have value1 and when it's at the other extreme the object has value2.  what value1, value2 can you handle?

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