Here is what each of the above CSS property stands for:
opacity: 0.5; This is the “very important” one because it is the current standard in CSS. This will work in most versions of Firefox, Safari, and Opera Browsers. This would be all you need if all browsers supported current standards. Which, of course, they don’t.
filter:alpha(opacity=50); This one you need for IE.
-moz-opacity:0.5; You need this one to support way old school versions of the Mozilla browsers like Netscape Navigator.
-khtml-opacity: 0.5; This is for way old versions of Safari (1.x) when the rendering engine it was using was still referred to as KTHML, as opposed to the current WebKit.