How to format imac without cd and system password?

I don't have the installation cds and i dont know the admin password of imac.

You are basically out of luck without a set of OS X install discs to boot from to either change the iMac's password or using Disk Utility to reformat the disk.
If you can't login to your iMac, you can't do anything.
You do not mention the year and CPU speed or your iMac.
There are two thing you can do. Called Apple at 1-800-MYAPPLE ask for software sales and ask about purchasing a replacement set of installation disks of the ones that originally came with your iMac. You will need to supply your iMac's serial number to receive the proper discs.
They are not free and the cost will vary depending on where these discs are shipped. I paid $18 U.S. Dollars for my replacement set of OEM install discs, shipping was included.
Second thing is I noticed you are on OS X 10.5 Leopard. If your Mac is an Intel model, you could, also, upgrade the OS X version to OS X 10.6 Snow Leopard by ordering a set of OS X 10.6 Snow Leopard discs from Apple's retail store site. These discs are $19.99 U.S. and you would be running a more recent OS as OS X Leopard is over six years, almost seven years old.
Here's the link
http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard
Good Luck!

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