DHCP server problem

I have two labs(lab1 & lab2);I have a DHCP Server on lab1.I have created a super scope.I want that my dhcp server assign ip-addresses(192.168.0.1 to 192.168.0.250) to lab1 computers and ip-addresses(192.168.1.1 to 192.168.1.250) to lab2 computers.
But it does not happening.
What else should i do.
Plz help me.