Can I repair my startup disk without installation disk?

Disk utility is showing me the following after I ran "verify disk":
The volume Mac HD was found corrupt and needs to be repaired.
Error: This disk needs to be repaired. Start up your computer with another disk (such as your Mac OS X installation disc), and then use Disk Utility to repair this disk.
I don't have the installation disk.  Is there a way to repair the disk without the installation disk?  I'm running mac os X 10.6.4.
Also, I'm very new to mac OS so please keep any answers/help simple for me.  Thanks.

If you have a TM backup on an external drive, restart the computer and hold down the option key. You will get a selection of drives. The TM drive has a recovery drive also. I think it will be listed as Mac OSX. Select it and try booting from it. Your internal drive might be bad and not allowing you to start from that recovery drive.

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