Note: the button image is made up of all three states and the background is made to change simply by altering the background-position in CSS.
The button image:
Style sheet: styles1.css
Style sheet: styles2.css
Style sheet: styles3.css
Note: the stylesheet for this is the same as the previous example, but you will find some individual styles in the <style> element in the <head> of this page targetting the first button.
Style sheet: styles4.css