Raising the clock speed on SAM7-H256 board

Hi, does anyone know how to raise the clock speed on the SAM7-H256 board?

There is an 18Mhz crystal on the board, but the Atmel chip can run at 60Mhz. I am using the chip for real time image processing so I need as much speed as I can get.

OK, I see now there is a PLL and the clock frequency can be multiplied up. NM.