.maintable .content .content_top {
    background: url('/i/back_content_top_3.png') 0px 0px no-repeat;
}

.maintable .content .content_center {
    background: url('/i/back_content_center_3.png') 0px 0px repeat-y;
}

.maintable .content .content_bottom {
    background: url('/i/back_content_bottom_3.png') 0px 0px no-repeat;
}