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

input.lsCheckbox[type="checkbox"] + label span {
    display:inline-block;
    width:23px;
    height:23px;
    background:url(../Imgs/checbox_sprite.png) left top no-repeat;
    vertical-align:middle;
    cursor:pointer;
    margin-left: 4px;
}

input.lsCheckbox[type="checkbox"]:checked + label span {
    background:url(../Imgs/checbox_sprite.png) -23px top no-repeat;
}