Lowering CPU speed to a minimum

Hi,
How do I set the processor in my MacBook Pro to always run at the lowest speed? I can't find any settings to lower cpu speed?
Why? So that when I'm surfing, I can get the maximum run time out of my battery.
PC's have an Intel speedstep utility that allows you to set the speed to as low as possible and keep it there. Does something like this exist for my MacBook Pro?
Thanks, William
MacBook Pro   Mac OS X (10.4.7)   2 Gb Ram

Hello, there is a way:
Open your System Preferences, go to Energy Saver, Show details, and there select Better Energy Settings. It's not necessary a CPU speed reducer, but you get more battery time...
The only way to reduce the CPU speed is to unplug the baterry, and run from the power adapter, which, I guess, it's not what you want.
CHeers
PS. Mark this topic as answered when satisfied with the answers.

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