Illustrator Rulers question

Is there anyway to change the ruler spacing in ILL 10. I know how to change it between like px, points and inches… But right now I have it set to px and the incriments are rather weird. I want the big bar on the ruler to be in some sort of incrent of 10…Right now it goes 0, 36, 72…and the little hashes in the middle are rather difficult to count in those incriments.

I hope someone understands…It is not a knock down emergency but it is terribly irritating.