Writing macro to support authentication automatically

Hi all,

As per my requirement, I will be getting some approval mails. Each mail will have one hyperlink which will be pointing to some website which when clicked the system ask for the authentication (username and password).
I want to write such a macro which when clicked is being taken care by the custom macro which will do some marshalling of user name and password and hence the system will directly lead to the respective page (rather showing the login page first)

ps: I do not want to see the login page.It should be taken care by the custom macro.is it possible or else should I think of some other approach?

Heartiest thanks in advance.