Here’s how to reset your OS X password without an OS X CD. You need to enter terminal and create a new admin account:
Hold apple + s down after you hear the chime.
When you get text prompt enter in these terminal commands to create a brand new admin account (hitting return after each line):
mount -uw /
shutdown -h now
After rebooting you should have a brand new admin account. When you login as the new admin you can simply delete the old one and you’re good to go again!