how to share 2 different internet connection in LAN

I’ve a internet connection from 2 different ISP
ISP1 =202.55.90.7
ISP2= 10.10.4.14

I want to configure my INTERNET connection in my LAN like
192.168.0.0/24 to use ISP1
192.168.0.100/24 to use ISP2

with same gateway 192.168.0.1

help me

One method to share the lines:
http://wiki.mikrotik.com/wiki/Manual:PCC

Another:
http://wiki.mikrotik.com/wiki/Policy_Routing_in_RouterOS_3.x (not an exact solution, but it is what you want)

Still another:
http://blog.butchevans.com/2008/09/mikrotik-policy-routing-implementation-example/ (a little outdated, but still works)

Did you even LOOK at the documentation?

thanks a lot