How to make an image opaque on Mac IE (and netscape?)

[mfindlay]

I am able to display an image as opaque by assigning the image a class with the following proprties:

.grayimage {
opacity: .5;
filter: alpha(opacity=50);
}

The above class definition works when viewed on all of the PC browsers we've tested (IE, Firefox, Opera, Netscape) and on Mac (Safari, Firefox).

However, it has no effect when viewed on the Mac IE and Netscape.

Is there no support for the properties in this css for Mac IE/Netscape, or do we just need to apply different values for those? (and what might those be? :)

Many thanks!

[dbldutch]

Support for IE on a Mac ended in 2005. Do you have to support it?

If it is not opaque on those browsers will they not get important information or will it simply look out of place? I'd guess people using IE on Mac are used to things looking out of place, plus they will probably be a very small portion of your visitors.