How to fade image to time points?

It sounds simple, but it's had me scratching my head for hours...
Does anyone know how to fade an image to certain opacities at certain points?
E.g... I want to start an image at 60% opacity, and then fade it to 25% opacity over two seconds. And then have it run at 25% opacity for another 20 seconds.
Any advice would be much appreciated.
Thanks

Thanks for the response, Mark.
But it doesn't seem possible to adjust opacity by recording. The option's greyed out. And the problem with the HUD is that it's simple to fade in and fade out. But anything more involved - like fading down from 100% - isn't possible.
But switch to keyframe editor, and anything's possible :o)

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