CSS Sprites not working in blogger

[ad10sk8er]

i have been trying to get my hover sprite to work in the blogger platform, but only the first image will show up.my css is as follows:\[code\].imagesprite { display: block; background-image: url(xxx); width: 400px; height: 400px; overflow: hidden; background-position: 0 0;}.imagesprite:hover { width: 400px; height: -400px; overflow: hidden; background-position: 0, -400px;}\[/code\]nothing happens then my mouse hovers.