How can i convert a .img disk image to a .dsk disk image?

I own an intel-iMac running MacOS 10.5.6.
I own both an Apple //c and Apple System Disk 4.0.2.
I now have an emulator called Virtual ][.
I also have a disk image of the Apple System Disk 4.0.2,
but it is in the .img format. I need it to be in the .dsk
format so the emulator can "see" the disk and run it.
How can I convert from .img to .dsk?
Thanks,
Apple //GS

have a look here:
http://discussions.apple.com/thread.jspa?threadID=246070

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