[UKBusinessLive]

Originally Posted by iogames

But I did place it on the right spot and nothing... a more exact line of code? someone?

Try this, it might work

.transparent_class {
	filter:alpha(opacity=10);
	-moz-opacity:0.1;
	-khtml-opacity: 0.1;
	opacity: 0.1;
}

But i think this is what your saying;

To get a semi-transparent background of a <div>
(or other element, especially list elements) and yet keep the 100%
opacity of the inner text

That is not how opacity works. The css 3 property 'opacity' applies to a box as a whole and its content (all the contents of that box). Opacity is not inherited, but all the contents of a box whose opacity is lower than 1 (<100%) will appear as semi-transparent (or faded). It is not applied to the background, but the box as a whole. All the content of that box will be affected.

You could try and use RGBA color values.

selector {background:   rgba(0,0,255,0.5) } /* semi transparent blue */

Have a peek here for more details http://www.w3.org/TR/css3-color/#rgba-color