.overlay {
    position: fixed;
    z-index: 99;
    top: 0px;
    left: 0px;
    background-color: #000000;
    width: 100%;
    height: 100%;
    filter: Alpha(Opacity=70);
    opacity: 0.70;
    -moz-opacity: 0.70;
}

* html .overlay {
    position: absolute;
    height: expression(document.body.scrollHeight > document.body.offsetHeight ? document.body.scrollHeight : document.body.offsetHeight + 'px');
    width: expression(document.body.scrollWidth > document.body.offsetWidth ? document.body.scrollWidth : document.body.offsetWidth + 'px');
}

.loader {
    z-index: 100;
    position: fixed;
    width: 120px;
    margin-left: -60px;
    top: 50%;
    left: 50%;
    color: #FFFFFF;
}

* html .loader {
    position: absolute;
    margin-top: expression((document.body.scrollHeight / 4) + (0 - parseInt(this.offsetParent.clientHeight / 2) + (document.documentElement && document.documentElement.scrollTop || document.body.scrollTop)) + 'px');
}