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Cisco ISP failover using one ethernet interface

I have two ISP routers on my network. 10.1.1.2 and 10.1.1.1 are the IP addresses of the firewalls.  I want to use my Cisco router 10.1.1.5 to be the default gateway of my network and control failover between my two ISP's.   I want to use SLA and I see how to do it using two router interfaces but I want to create failover using just the one interface.  For example. if 10.1.1.1 goes down I need the default route on the Cisco router to change from 0.0.0.0 0.0.0.0 10.1.1.1 to 0.0.0.0 0.0.0.0 10.1.1.2


Thank you.  Any help would be appreciated

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Don Johnston
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worked perfectly thank you.  I made one addition to the quick and dirty version.  I added a static route to the outside address through the  primary isp.  I did this so the route knew when it was coming back up and switched over again.  Thanks again.
worked perfectly thank you.  I made one addition to the quick and dirty version.  I added a static route to the outside address through the  primary isp.  I did this so the route knew when it was coming back up and switched over again.  Thanks again.