How can I securely format my hard drive, without an installation cd?

I have OS X Lion. I recently purchased this Macbook Pro 15" laptop, and I am planning on returning it, to get the newer upgraded laptop, as the store manager said I can do this, since I purchased my laptop within 30 days of the announcement of a new MacBook Pro. I would like to format everything, before I return it back to the store, however, it never came with an installation cd. How can I do this? I have tried ways that I have heard, such as creating a new admin user account and deleting all the other accounts. Also I have erased all the free space using the disk utility section. However, it will not allow me to erase the hard drive. Is there a way to do this without an installation cd? Thank you.

How to deal with future problems without a Lion Install Disk - https://discussions.apple.com/thread/3552183
Lion - Disk Utility - https://discussions.apple.com/message/16925522 - repairing your drive using Disk Utility on Lion's recovery partition.
OSX: About Lion Recovery - http://support.apple.com/kb/HT4718 > Lion Internet Recovery - using the Internet to start when recovery disk partition not available.

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