Deskew a pdf?

I'm trying to digitize a book for someone, however, after trying to deskew the pages by using both, Acrobat-> optimize pdf, and also using the crop and straighten tools on photoshop, I am left with the top of the pdf being straight and the bottom slightly skewed. My question is what can I do to deskew the bottom of the page?
ex. [IMG] http://i61.tinypic.com/10qh37a.jpg [/IMG]

I would deskew only in Photoshop. InDesign's optimizing functionality is not for repairing files for print in InDesign.
In the same slot as the Crop Tool in Photoshop's tool panel you find the Perspective Crop Tool.
Select only the text part, leave the whit away as it reduces file size. It is important that the image scan has at least 8 bit/channel, not a 1 bit (bitmap in Photoshop):
After croping it is at least rectangular:
Might be that you have to correct the ratio.
The next step would be Unsharp Masking, reducing to 1bit (in this case), save as 1bit PSD file and place it in InDesign.

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    ex. [IMG] http://i61.tinypic.com/10qh37a.jpg [/IMG]

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    Message was edited by: computer-girl

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