I've overwritten my Mac OS with Windows Vista, how can I get my Mac OS back

I Was downloading a Windows Vista OS on my Mac and I accidentally deleted the Mac OS. How can I get my Mac OS back? Can I use the CD's accompanied with my MAC
when I put the DVD to Install the MAC system from vista...It doesnt give an option for ordinary installtion but it gives me an option for remote installtion (which it needs an network or internet connection or something like that...) what should i do ??
:(:(

You need to repartition the drive. While booted from the DVD, select Utilities > Disk Utility from the menu bar. In Disk Utility, select the boot drive from the list on the left. It will have a long name starting with the capacity in GB. Click on the Partition tab. Choose "1 Partition" as the volume scheme. Click on the Options button near the bottom of the window, then click on the button labeled "GUID Partition Table." Finally, click Apply. When the partition finishes, you can quit Disk Utility and go back to the Installer. You should now see your internal drive as available for installation.

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