Overlay, 2

#TB_overlay {
    Z-INDEX: 100; LEFT: 0px; WIDTH: 100%; POSITION: fixed; TOP: 0px; HEIGHT: 100%
}
.TB_overlayBG {
    FILTER: alpha(opacity=75); BACKGROUND-COLOR: #000; opacity: 0.75; -khtml-opacity: 0.75; -moz-opacity: 0.75;
}
 HTML #TB_overlay {
    POSITION: absolute; HEIGHT: expression(document.body.scrollHeight > document.body.offsetHeight ? document.body.scrollHeight : document.body.offsetHeight + 'px')
}
BODY > div#TB_overlay {
    POSITION: fixed; HEIGHT: expression(document.body.scrollHeight > document.body.offsetHeight ? document.body.scrollHeight : document.body.offsetHeight + 'px')
}