input[type="checkbox"].niceCheckbox {
    display:none !important;
}
input[type="checkbox"].niceCheckbox + label span {
    display:inline-block;
    width:16px;
    height:16px;
    margin:-1px 0px 0px 4px;
    vertical-align:middle;
    background:url(../../img/checkbox/check_radio_sheet.png) left top no-repeat;
    cursor:pointer;
}
input[type="checkbox"].niceCheckbox:checked + label span {
    background:url(../../img/checkbox/check_radio_sheet.png) -19px top no-repeat;
}