#tikiThickBox_overlay {
    position:absolute;
    left:0px;
    top:0px;
    width:100%;
    height:100%;
    background-color:#000000;
    z-index:9999;
    opacity:0.75;
    -moz-opacity:0.75;
    filter:alpha(opacity=75);
}

#tikiThickBox_window {
    position:fixed;
    top:50%;
    left:50%;
    z-index:9999;
}