Currently Being ModeratedApr 10, 2013 1:16 PM (in response to detour12)
Leopard 10.5 is NOT legally availble for download (never was a downloadable OS).
Any Leopard 10.5 version you find available for download may have compromized software inside. BitTorrent copies of Apple software has been known to contain malware.
As OGELTHORPE says, you will need to find a 10.5 retail disk(s) (not the gray disks) in order to know you are installing a good copy of Leopard 10.5