What do the two caps connected to the crystal to ground do? (C2 and C3 as seen here: http://www.arduino.cc/en/uploads/Main/Arduino-Diecimila-schematic.pdf The schematic calls for two 22pF caps. If I wanted to breadboard/"one-off" an arduino clone, do I need to stick to that exact value?

What do the two caps connected to the crystal do?

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