HSRP with DSL and T1

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Hi, I have two sites connected through WWW(routerA below) and am trying to configure HSRP for redundancy at both sites by subscribing DSL(routerB).

My current layout: WWW | routerA(T1) | | Firewall | | LAN

PLAN for redundancy: WWW --------------| | | routerA(T1) routerB(DSL) | | | | Firewall -------------| | | LAN

I have a couple of questions. I'd appreciate your help.

1. Currently routerA uses public IP. Do I need another two valid public IPs(one for the additional DSL router and another for virtual IP in HSRP)?
2. How does the incoming traffic work? Can incoming traffic come through either routers IP, virtual IP, or active IP?
3. Is there a way to utilize both T1 and DSL without having to put one in inactive status most of the time?

I hope I provided enough information to clarify my question...:-).. Thanks, DW