FORM Authentication for HTML UI with ASP.NET application

Hi All,
My ASP.NET application has all HTML UI's and not a single aspx page. All HTML pages will have Ajax call(jQuery , JSON input JSON output) which will invoke WCF service to get and post data.
I want to implement form authentication with this application.
If user try to access any UI without log in ( suppose HTML1.html) he should be redirected to LogIn.html . and once logged in successful he should be always on home.html
 
 
Any inputs will be appreciated.
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