login control with superadmin

Hi to All,


I am designing a website, which has a login module.. here 3 users/persons (mainly) will be accessing the login page:

Superadmin (domain owner)
Local admin (under domain owner)
Normal user (under local admin)
Where domain owner has rights over local admin & normal user, and local admin has rights over normal user..

Now, how can I differentiate the login type for the above users?

I have tried putting a dropdown, and adding the three members, but I don't feel it looks good.

Any ideas of doing the above scenario?