Cannot Create Encrypted Disc Image

So, I can't seem to create an encrypted disc image in Disk Utility, as the linked screen capture shows:
http://imgur.com/7dv3t.png
The "Create" button is grayed out. This occurs even if I try different settings for Volume Format, Partition, Encryption, and Image Format.
Anyone have any ideas on why this is happens?
(Running 10.5.8 on a MBP Santa Rosa, with no modifications except for 4GB of RAM, and I wasn't able to create disc images even before the 10.5.8 update.)

No problem. I remember being stumped by the exact same thing myself.

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