td.disMainVideo td.btnC {
    background-image:url("../Discovery/it/dis_short_video.jpg");
}

td.disMainVideoOver td.btnC {
    background-image:url("../Discovery/it/dis_short_video_over.jpg");
}
td.disMainVideoSupplier td.btnC {
background-image:url("../Discovery/it/dis_short_video_supplier.jpg") !important;
}

td.disMainVideoSupplierOver td.btnC {
background-image:url("../Discovery/it/dis_short_video_over_supplier.jpg") !important;
}