Css bug in Chrome ?

I made a page with a few mouse-over's and swap images. Everything works fine, except in Google Chrome. I think there's something wrong with de css (display). It's quite complicated to explain, so here my link to the page. You can check the code if you want.
mouse over test
Purpose : When the black image disappears on mouse over, you see another image. On mouse over on a color, a frog in that color appears with the name.
In Chrome it doesn't work