How can I change the password without the startup disk?

I recently purchased a used Macbook OS X 10.4.11. I don't know the password, and couldn't get the disk so I can reset it.
If anyone could help me, that would be much appreciated! I'm new to this whole Mac thing, I bought it for college next year.
Thanks!

Hi emathers, and a warm welcome to the forums!
As long as it's not a Firmware Password set, Reset OS X Password Without an OS X CD...
http://theappleblog.com/2008/06/22/reset-os-x-password-without-an-os-x-cd/
Once you've done that the computer reboots and it's like the first time you used the machine. Your old accounts are all safe. From there you just change all other account passwords in the account preferences! (Use a new Shortname & such so as not to interfere with the original)
applesetupdone...
http://discussions.apple.com/thread.jspa?messageID=6059333&#6059333
http://www.askdavetaylor.com/howdo_i_reset_my_mac_os_x_admin_rootpassword.html

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How can I change the password without the startup disk?

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