Pasted

.transparent {
    /* Required for IE 5, 6, 7 */
    /* ...or something to trigger hasLayout, like zoom: 1; */
    width: 100%; 
 
    /* Theoretically for IE 8 & 9 (more valid) */
    /* ...but not required as filter works too */
    /* should come BEFORE filter */
    -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
 
    /* This works in IE 8 & 9 too */
    /* ... but also 5, 6, 7 */
    filter: alpha(opacity=50);
 
    /* Older than Firefox 0.9 */
    -moz-opacity:0.5;
 
    /* Safari 1.x (pre WebKit!) */
    -khtml-opacity: 0.5;
 
    /* Modern!
    /* Firefox 0.9+, Safari 2?, Chrome any?
    /* Opera 9+, IE 9+ */
    opacity: 0.5;
}