how to create small login page by Java script or j query?

Question

when i click on login image ,1 small window opens for username and password, when i login, i go to my profile how to make that small window?

as your URL is "http://www.c-sharpcorner.com/Forums/Thread/237446/how-to-make-menu-bar-with-in-the-asp-net.aspx"..And i attached that page.