Erased hard dirve.  How to determine correct OS X to reinstall, and if I need to order DVDs or if I can reinstall online

The hard drive was erased.  Disk utility suggests that Snow Lep. can be reinstalled however I beleve the OS X was an earlier version.  1) how to determine correct OS X to re install.   2) do I need to resinstall of disks over can it be done over the internet?  Thanks in advance

You need to start with the version that was originally installed.
If you are in the US call Apple Customer Support 1-800-767-2775, provide the Serial Number and specifications of the Mac, and for a reasonable fee, they will supply a replacement set of system discs (if available).
The discs will be for the original version of the OS that was pre-installed when the Mac was manufactured.
If you are in another country:
http://support.apple.com/kb/HE57
If you are running Lion or Mountain Lion you won’t have been given disks. Instead you use the recovery partition or internet recovery:
http://support.apple.com/kb/HT4718

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