.paypalsprite{
    background: url(paypal_sprite.png) 
    no-repeat; display: block; float: left; background-position: 0 0; 
    height: 42px; width: 157px;}

.paypalsprite:hover,.paypalsprite:focus{
    background-position: -157px 0;}

.paypalsprite:active{
    background-position: -314px 0;}