Disk Utility says I have a corrupt hard drive...

Had a problem with an application and was advised to run Repair Permissions in Disk Utility (it was fixed when I did that).
Out of curiosty I ran Verify Disc on my hard drive and was shocked to find the following message:
...In valid directory count
...The volume Macintosh HD was found corrupt and needs to be repaired
..."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'm unsure how to proceed. The iMac didn't come with a installation disc.
How can I repair this?
Thanks

Repair the Hard Drive and Permissions - Lion
Boot from your Lion Recovery HD. When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
To boot from the Recovery HD restart the computer. After the chime hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.

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