CSS Guru's please offer sugg.

Hey guys,

Anyone want to share a code for a div that is a certain LxW, that will ALWAYS stay 10 pixels from the right edge of the browser window (no the website margin). Also vertically centered from top of the browser window edge to the bottom edge. So that whenever I scroll through a page the div (which will hold a menu) will move over the site easily without the browser 'out scrolling' it. Not sure if you guys got that. Let me know if you need an elaboration..

basically a menu that sticks with the center of the browser window (not page design).