CSS Sprites not working in blogger

[ambipur]

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:.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;}nothing happens then my mouse hovers.