* html .authorization_dialog { /*хак для ИЕ6*/
    position: absolute;
    top: expression(parseInt(document.documentElement.scrollTop + document.documentElement.clientHeight - this.offsetHeight, 10) -280 + "px");
}

* html .authorization_overlay { /*хак для ИЕ6*/
    position: absolute;
    top:expression(eval(document.documentElement.scrollTop));
    opacity: 1 !important;
    background: none !important;
}

.authorization_overlay {
    position: fixed;
    left: 0px;
    top: 0px;
    right: 0px;
    bottom: 0px;
    background: none !important;
    z-index: 9990 !important;
    opacity:1 !important;
    width: 100%;
    overflow: visible;
}