filter:alpha(opacity=50); /* Internet Explorer 6 */
-moz-opacity:0.5; /* Mozilla 1.6 and prec. */
opacity: 0.5; /* CSS3 and Mozilla */
filter:alpha(opacity=50); /* Internet Explorer 6 */
-moz-opacity:0.5; /* Mozilla 1.6 and prec. */
opacity: 0.5; /* CSS3 and Mozilla */