.modal_mask { position: fixed; top: 0px; right:0px; left: 0px; width: 100%; height: 100%; opacity: .2; background-color: #CCCCCC; color: #FFFFFF;}.modal_mask_ie { position: absolute; top: expression(eval(document.documentElement.scrollTop)); left: expression(eval(document.documentElement.scrollLeft)); width: 100%; height: 100%; filter: alpha(opacity=20);  background-color: #CCCCCC; color: #FFFFFF;}