Pretty simple, you just gotta have a few divs, all over each other and the same size, then just link some text or a button to the div, and it will come onto the top, i think i have an example, but i gotta dig it up.
Computer: Mac Mini Intel Core Duo 1.66GHz, 1GB DDR2 SDRAM, 80GB Internal HDD, 200GB + 400GB External HDD, Bluetooth, 11.2 Surround Sound, Apple Wireless Keybaord, Logitech Trackball, Wacom Graphics Tablet. Mac OS X 10.4.8, Windows Vista Ultimate..
Student: At University of Plymouth, Studying BSc (hons) Web Applications Development