Running SL from an external drive on Lion-installed iMac

I recently installed Lion on my iMac with the intention of having Snow Leopard bootable from an external drive when I need to run all my PPC apps etc.  Having formatted an external drive, I put in the Mac OSX SL DVD into the Mac to install it on to the external drive, but before I could do this, a message appears:
" You can't use this version of the application Install Mac OS X with this version of Mac OS X. 
                                               You have install (sic) Mac OSX 23.1"
Can anyone interpret this message for me please?
Thanks

The SL DVD. If you actually tried it, you'd have found that the blank drive doesn't appear because it doesn't yet contain Mac OS X.
(59758)

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