Clean reinstall Lion without the OS disc

Hi, I want to erase my hdd and reinstall Lion OS on it but I do not have the installation disc with me. Can you please suggest me the best method to do this ?

You will need to download Lion, but before any update starts - create a bootable DVD or thumb drive

How to Burn Your Own OS X Lion Install DVD or USB Drive

Why do you need a disc?

Just boot the machine pressing and holding Command + R. Lion applies a hidden recovery partition and this contains the functional equivalent of a boot disc.

Thanks for both replies.