How can I boot my (OS Lion) Macbook (using external drive) to run Leopard

   I have recently installed Lion on my macbook. Previously, I had Snow Leopard. During that time, I used an external hard drive to boot into Leopard to run some programs that didn't run on SL (Spring Cleaning, for example).
   Today is the first time I tried to boot from the hard drive with Leopard on it since upgrading to Lion. Hitting Option during startup doesn't even show the external drive, and using the System Preferences/ Startup Disk method is equally useless.
   I like Lion and don't feel like doing a total re-install just to have occasional access to an older OS, but I'd sure like to have it all!
Any ideas for a workaround?

Verify that your external drive was formatted as GUID, it won't be bootable otherwise.

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