input[type="checkbox"] {
    display:none;
}

input[type="checkbox"] + label span {
    display:inline-block;
    width:40px;
    height:44px;
    margin:-1px 4px 0 0;
    vertical-align:middle;
    background:url(sprite.png) left top no-repeat;
    cursor:pointer;
}

input[type="checkbox"]:checked + label span {
    background:url(sprite.png) -40px top no-repeat;
}