CSS Transparency Settings for All Browsers
.transparent_class {
opacity: 0.5; /* the standards compliant attribute that all browsers should recognize, but… */
filter:alpha(opacity=50); /* for IE */
-khtml-opacity: 0.5; /* for old Safari (1.x) */
-moz-opacity:0.5; /* for old skool Netscape Navigator */
}
(via)
