.loader_slh {
    position: fixed;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
    z-index: 9999;
    opacity:0.5;
    background: url("../../../wp-admin/images/spinner.gif") 50% 50% no-repeat rgb(249,249,249);
    display: none;
}
.wp-admin #TB_window{
    overflow:auto !important;
}