If both monitors are analog, then connect one monitor to the VGA output on the 5200FX card, and connect the other monitor to a DVI-to-VGA adapter and then connect the adapter to the DVI output on the card(If an adapter is not supplied with the card, then you can buy one from a supplier, like Belkin).
If one of the monitors is digital, then it can be connected directly to the DVI output without an adapter.
Once the two monitors are connected, then they can be configured in the card's nView software found in Display Properties.