.radiobutton {
   background-image: url(../../image/custom/radiobutton/radiobutton.png);
   background-position: center center;
   background-repeat: no-repeat;
   cursor: pointer;
   display: inline-block;
   height: 18px;
   width: 18px;
}
.radiobutton:hover {
   background-image: url(../../image/custom/radiobutton/radiobutton-hover.png);
}
.radiobutton.checked {
   background-image: url(../../image/custom/radiobutton/radiobutton-checked.png);
}
.radiobutton.checked:hover {
   background-image: url(../../image/custom/radiobutton/radiobutton-checked-hover.png);
}