If its an old 'fat' PS2 (v1 - v7) then there are ways to play online with it, on both US & PAL games. But if its a slimline, then you're outta luck I'm afraid. It'll only play PAL games online.
Best Source For Your PS2 Needs. Always
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Our Latest IDs: Test Drive Unlimited(PAL), Snooker 2007(PAL), UEFA Champ League 2006-07(PAL), MVP 07 NCAA Baseball(US), CollegeHoops2K7(US), ArenaFootball:RoadToGlory(US)