2 Wan, 1 Lan, check gateway problem

Hello everyone. I have a RouterBoard 750 configured for 2 WAN and 1 LAN connection. The problem is that i have two routers for two different internet connections, so on the route list, if i set check gateway ping, mikrotik will ping the router (because it is on) so it will keep using that gateway although i dont have internet from the router. Is there another way to check for a specific address (like pinging google from the wan that has no internet) so to move all the traffic to the other wan?

I also have problems specifically with tournaments on facebook (people cannot play on tournaments), but this is a secondary problem.

Thnx everyone in advance.

http://wiki.mikrotik.com/wiki/Advanced_Routing_Failover_without_Scripting