I have an 8GB flash drive and a .img disk image of Windows 7. How do I make a bootable flash drive?

I have a Macbook Pro with Snow Leopard, and I've already partition 50GBs of space for Windows 7. The disk image is already on the flash drive , but when I hold the option ket at start up and try to boot up Windows from the flash drive I get an error message. Is there something else I need to do to make the... show more I have a Macbook Pro with Snow Leopard, and I've already partition 50GBs of space for Windows 7. The disk image is already on the flash drive , but when I hold the option ket at start up and try to boot up Windows from the flash drive I get an error message. Is there something else I need to do to make the flash drive bootable?
Update: Unfortunately that doesn't help me because, as I said, I have a Mac.
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