Is there anyway I can show a gray semi-transparency over any elements with a certain class (”disabled”)?

.disabled {
background-color: #666;
width: 100%;
height: 100%;
-moz-opacity: 0.7;
opacity: 0.7;
filter: alpha(opacity=70);
}

The first rule provides opacity levels in Gecko based browsers (Camino, Firefox, SeaMonkey), the second to Safari (and Opera I think), and the third is an IE specific one, which I suspect is not valid code, but which works.

Font selection for the Web should be based on a generic font family to ensure an appropriate type style is rendered in any circumstances. Specific named fonts can then be declared in order of preference and tailored for specific platforms, but which to choose? This article compares the most common fonts for Windows, Mac and Unix family systems.