two different form tags with runat=server in ASP.Net

I want to make a page exactly similar to Facebook Login page which has 2 textboxes(having validation control) and 1 button(Login) at the right corner and in the main page there is a SignUp page having some textboxes(These should also have validation controls) and button.
I cant make this page in ASP.net since it will need two Form tags with runat=server which ASP.net compilar cant compile.
please help me out to make it.