.changeimg {
    background-image: url(../Icons/buttonRadioSpot.png);
    background-repeat: no-repeat;
    width: 129px;
    height: 126px;
    position: absolute;
    left: -78px;
    top: 65px;
}
 .changeimg.minus {
    background-image: url('../Icons/buttonRadioSpotStop.png');
}