How do i remove the bios password on hp omnibook 6000 note book?

Hi I have the hp omnibook 6000 notebook laptop and i want to upgrade to a larger hard drive but the bios is password protected how it became like that i can only guess that previous owners must have put in a password at some time and when i removed the hard drive to see what type i needed to upgrade, the password reset itself, as prior to this i had no problems accessing the bios .I can still boot up and run xp pro
Can any one help