I suggest you look for FSB in wiki and follow the links. U'll understand what is overclocking.
Dont read the below lines now. read after you understand whats overclocking.......
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I know u didn't go thro wiki.....
anyways...to overclock u should increase the FSB and/or the proc's i/p voltage. You can do this thro' BIOS. There are already umpteen threads on overclocking. Heres one.....
A newbie's guide to Overclocking a Athlon XP CPU
this might not be for ur proc...but its almost the same.