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Mick,
What version of Photoshop are you using? If CS3, have you tried the automatic process for stacking?
It's under Files, then either Batch or Scripts... something like Stack Images it's called (I don't have access to PS ATM so I'm forced to make it up as I go along - that should inspire confidence!). In the dialog there is a check box for "align frames based on content".
I have used that with some success. The key is if there is enough that PS recognises as the same between the frames, so it may not work on radically different exposures.
Al.
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