Restore MAC OS X after removing its partition from windows?

I created a new bootcamp partition on my macbook air and installed windows 7. Then I realised I had little use for the MAC OS partition and, from windows, formatted that drive to get the extra space,so my MB had 2 particions:
- C drive (Bootcamp)
- D drive (labelled just "new drive").
Now I would like to restore the Mac OS partition on the D drive, but I do not want to erase Bootcamp. However if I restart the computer pressing the C key and with the USB reinstall drive in, the only drive where I can apparently install mac os is bootcamp.
I have not advance after that step since I do not want to erase bootcamp. Any clues as to how to proceed here?
thanks!

You can format "D:" again to HFS from OS X Lion or DVD
You do not want to use WinClone to the same hard drive, terrible.
You can install OS X to external drive - partition the drive for OS X, WinClone perhaps or CampTune (also makes backup restore images) - and for TimeMachine.
CampTune will also 'redistribute' space between HFS and NTFS partitions.
Their "Pro" Suite can convert HFS <=> NTFS without loss of data - of course it would be foolish to not have backups.

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