H1-B visa expires Before I-797

[Kashyap]

My H-1B visa expires on 01Dec05 and my work permit I-797 expires 26Mar06. Can I continue staying beyond the visa expiry date until 26Mar06 without revalidating my visa?

I am travelling to India, planning to be back 27Nov05, 4 days before the visa expires. Will this be a problem? Any help will be appreciated. Thanks,

KM