Configure Gateway failover

[cuhbe]

Hi both,
I have a simple question.
I have 2 operators in my company each one provide an internet access.
I need to setup my Alcatel 6850 to use the second router if the first one is dead.
I have no other equipment that i can use for this purpose.
My first gateway is 192.168.1.1/24
My second gateway is 192.168.2.1/24

Do someone know how to do this ?

Thanks a lot to all of you.