Question : configuring Failover and Fallback connection

Hi,
We have PCs with LAN connection and Dialup connection as well. They are using Dialup if Internet on LAN connection goes down. Is there anyway, I can confgiure both as failover and fall back automatically in windows XP, using any software or Scripts. LAN interface does not go down but sometime Internet becomes unavailable. User dial dialup but they dont disconnect even primary connections comes back.
Regards,

Answer : configuring Failover and Fallback connection

One such dial-up fail-over router:
http://www.smc.com/index.cfm?event=viewProduct&cid=1&scid=17&localeCode=EN%5FUSA&pid=858
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