Is it possible to have multiple clients' custom login page?

If I have 3 different login web pages. 

Each with a user name and password input.

When a user enters their credentails and clicks login, is it possible to take those credentials and pass it to the spotfire login page?

Then using some javascript to automatically login into that page.

I know it is possible to customise the spotfire login page but this would mean all user would have the same login page.

I'm looking to have 3 seporate Urls all directing to the same instance of spotfire, is this possible?

(1) Answer