Yoda says: Hmmm...CSS need you will, to make xp look on buttons, mmhmmmm...
if you're running XP, then all buttons (unless they have an overriding css class) will default to the xp look. But, if you want your buttons to have that same look, i'd play around with xp. The alternative is to create an image of an xp button, and use image buttons in your pages. but this can be clunky (especially since you'd need to change the wording for each button in the graphic)
D'Arcy