implementing failover capabilities

There were two separate networks which resided in two different buildings at my company's present location which have since been merged into one network which spans two buildings. Each of these networks had it's own cisco 2610 router connected to a full T1 line for internet access. Both of these networks had different internet service providers. Now that the networks have been merged into one all of the equipment is now going to be housed in one building. One of the ISPs (AT&T) has agreed to move its' circuit into the new building. Is there anyway to utilize only one of the cisco 2610 routers to host both of the 2 different ISP providers circuits in some type of failover configuration so that if one isp's circuits goes down the other would take over. What additional router hardware would we need in order to accomplish this. Any help would be greatly appreciated. Thanks in advance, LeRoy.

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