My ext. hard drive won't dismount.

I have 2 G-Tech firewire external hard drives.
G-Tech's website says all their drives are Time Machine ready.
I mounted them and they work beautifully.
BUT.
I cannot dismount them. I have tried everything I can think of. What am I going to do? They have critical files on them and I am afraid to corrupt them by restarting.
G-Tech's office is closed until Monday. I doubt they'll be able to help me anyway.
Anybody have any ideas? I am connecting to them thru my MacBook, so I can't stay plugged into them forever. I need to eject them.
Help! Help?
Thanks.

Nevermind. I just relaunched the Finder, and then I could dismount them. Whew.

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