Cant boot my OSX Disc!


I have an iMac DV SE and i want to install OSX on it.
When i open the installer on the cd and click the continue button it shows me an error message (error code -2) that tells me that i cant use that disc as a startup disc. Then...The application quits and i cant install....If i hold down the C key when i start the computer it displays an Systemfolder icon with an \"?\" in it...I just cant boot from my OSX cd...

Can anyone help me?
I've heard of this problem before. Are you sure you're using a CD from apple and not one that has been made into a Toast Image and then put onto a CD-R?