CSS Sprite tech

sprite.css

.sprite {
    background: url(sprite.png) no-repeat;
    width: 100px;
    height: 100px;
}

#red {
    background-position: 0px 0px;
}

#blue {
    background-position: -150px 0px;
}

#green {
    background-position: -300px 0px;
}