Disk repair from OS X install disk

I am sure I have done this before, but I can't for the life of me figure out how to repair my hard disk. I ran the check for the installed disk utility and found there were problems. It says to do the repair from the OS X install disk.
Do I have to start up from the install disk? and if so how?
How do I do this?
iMac G5 Mac OS X (10.4.7) 160 GB internal, 320 GB and 1TB external hard drives

Thank you, I remembered to hold down the C key on startup, but got mixed up after that. I had looked around a bit but couldn't find what I wanted.
I appreciate the help! It only took a minute when I knew what I was doing. I had spent about 1/2 hour doing the wrong things and trying to find out what to do.
I had problems with the disk and permissions. I hope the computer quits acting crazy now.
iMac G5 Mac OS X (10.4.7) 160 GB internal, 320 GB and 1TB external hard drives

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Many thanks in advance for your attention.
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If you are booted from the second installation, so it can look for its
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A clone is nice, if you can make more than one; an initial clone at
the point you first install a new system and update it; then a later
clone with your Mac's current complete hard disk drive, in use.
Then, you can be in a position to repair/replace and other tech
tasks with your computer, and not have to re-install. Just clone
or boot from an external clone. (Disk Utility can make/move .dmg
files and disk images of your installation can be re-used.)
Good luck & happy computing!
{edited}

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He is talking about making a Live CD/DVD.. You know, where you boot up and run the OS right from the DVD/CD.
From the CloneX documentation-
Bootable DVD
This function provides an easy way to build a customized bootable Mac OS X DVD that includes one or more applications. Such DVDs are generally dedicated to utilities that repair disks, partition disks, backup data, or recover data. Such DVDs can be usefull when it is necessary to restart from another disk to run operations on the main hard disk. The DVD is related to the hardware it is created on, so it’s compatibility may vary depending on the machine used. For example, a DVD created on a PPC machine will not boot an Intel Mac. Contrary to previous version of Clone X, the System includes more libraries and frameworks to try to be the most compatible possible with applications. The drawback is that data will not fit on a CD-ROM anymore. You must use DVD. The System on the DVD is a limited one, and there is no Finder available on DVDs created by Clone X. But Clone X installs a special launcher, CXLauncher, to run any of the applications copied in the DVD.
Creating the DVD
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To remove one application from the DVD, select it in the right list and click the right arrow button.
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----------------

Disk repair from OS X install disk

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