Why do you want to overclock your laptop? Overclocking won't necessarily improve performance and might even decrease it if not done with proper cooling. In my opinion, it is a tricky enough task overclocking a desktop pc with proper cooling arrangements, and personally, I wouldn't ever try it out on a laptop. Still you can try googling a specific query related to laptop overclocking and see if you find someplace that suggests it.
A good starting point for this stuff is :
http://www.overclock.net/