Hello I wonder how to create a new screen like in: Salesforce](null)

Cek the contact us button: If you click it a big form screen appears. How to create such a thing ?

Also, if you ever fill in a form, they know your name etc., do they save visitors information from cookie ?

Here's couple of pop up screens: http://fancybox.net/
You can find lot of these on google: jquery popup screen

And yes the information are stored in cookies

Or u can just try some few tricks with css3's box-shadow, border-image, position, overscroll, and canvas for the menu header. Hope u understand that