2 Gateways 1 Lan with load balancing

Who can give me a working config for 2 gateways with load balancing, traffic going through both gateways equally. And another senario with 2 gateways 1 Lan with traffic going through the gateways in the ratio of 2:1 Please assist anybody been working to find a perfect load balancing for 3 days now but with no good results. Most traffic goes through 1 of the gateways

http://www.mikrotik.com/testdocs/ros/3.0/ip/route.php