restfull authentification

Hi,

When I open an authentification page in firefox my login-password are
accepted in a web formulary.

In Internet explorer I have a window (authentification popup of
windows?)
to fill. The same login-password don't pass. (OS : Vista).
on the other hand if I push cancel button in this window I come back in
a web formulary as with firefox, then I can pass the authentification.

Is there any ROR configuration for remove the authentification window on
IE?

Thanks.