.location-filter-button input[type="checkbox"] {
    position: absolute;
    left: -9999px;
}
.location-filter-button input[type="checkbox"] + label {
    background: url(sprite.gif) 0 0 no-repeat!important;
    padding-left: 20px!important;
}
.location-filter-button input[type="checkbox"]:checked + label {
    background-position: 0 -32px!important;
}