the easiest way to do this
select top most layer
layer -> new adjustment layer -> hue/saturation (or add directly from the layers palette).
pickup batch's process at step 4.
the great thing about adjustment layers is that they are non-destructive, and since it is a layer like any other, you can turn it off, or add layer masks, or open and edit it at any time.
* non-destructive meaning not-permanently altering the image. meaning, if you save and close the image, you open it later and still turn off or change the effect. if you just do an image->adjust->hue/saturation, you can undo while the image is open, but once you save and close, that's it. there's not changing it after that.
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