CSS Sprite background switch check.

I'm learning about CSS sprites for background switching and wish to change my web site from the old onmouseover / onmouseout of JavaScript. I've tested on Windows 98 and XP, but not on Win7, a Macintosh, nor any Unix version. I've tested in the browsers available to me, but that number is quite small. I'm looking for people to have a look using other OS and browsers and tell me that my test page does or does not work. Please have a look:
http://spruce.flint.umich.edu/~jalarie/sprite.htm

Except for the fonts, they seem to work the same on Win7 with IE8, FF3, Safari 5, and Opera 11.

Except for the fonts, they seem to work the same on Win7 with IE8, FF3, Safari 5, and Opera 11.

Thank you.

The upper "font" was done one pixel at a time in MS Paint; the lower buttons have text in your browser's default font with the sprite background. I'll be saving over a dozen image downloads and a lot of mouseover/out JavaScript code per page!

Thanks, again. It looks like this project is a "Go."