#image1 a:hover img {
    filter: progid: DXImageTransform.Microsoft.Alpha(opacity=50);
    -moz-opacity: 0.7; /* Mozilla 1.6 */
    -khtml-opacity: 0.7; /* Konqueror 3.1, Safari 1.1 */
    opacity: 0.7; /* CSS3 - Mozilla 1.7b +, Firefox 0.9 +, Safari 1.2+, Opera 9 */
    filter: alpha(opacity=70); /* IE 5.5+ */
}