#modal-overlay {
    position: fixed;
    z-index:100;
    top: 0px;
    left: 0px;
    height:100%;
    width:100%;
    background: #000;
    display: none;
}
#modal-window {
    position: fixed;
    z-index: 102;
    display:none;
    top:50%;
    left:50%;
}
* html #modal-overlay { /* ie6 hack */
    position: absolute;
    height: expression(document.body.scrollHeight > 
            document.body.offsetHeight ? 
            document.body.scrollHeight : 
            document.body.offsetHeight   'px');
}
* html #modal-window,
* html #modal-load { /* ie6 hack */
    position: absolute;
    margin-top: expression(0 - parseInt(this.offsetHeight / 2)
    (TBWindowMargin = document.documentElement && 
    document.documentElement.scrollTop || document.body.scrollTop) 'px');
}