/*
Mozilla (e.g. Netscape, Firefox, Mozilla Proper, Camino etc.)
Scale: 0 - 1.0
*/
-moz-opacity:0.5;
/*
Internet Explorer
N.B. The element must have a defined width and height (not verified yet)
Scale: 0 - 100
*/
filter:alpha(opacity=50);
/*
CSS 3
N.B. As yet unsupported
Scale: 0 - 1.0
*/
opacity:0.5;
/*
Safari
N.B. Unable to verify
Scale: 0 - 1.0
*/
-khtml-opacity:0.5;