Want a transparent display

[RockOn]

I would like to make a display to display a warning message. In fact, the HTML page was already sent and it is important that this framework is shown above (with a bit of transparency)

But I do not know whether to do this in css, javascript or something else!

[fellah]

The 2 are possible, you need to make a div (last element of the body) in CSS:

#maDiv {
  position: absolute; // to position above the rest; 
  -moz-opacity: 0.5; // property of transparency (0 to 1) for old browsers 
  opacity: 0.5; // property standard CSS 2 (and 3) for Firefox, IE8 and browser tt faithful to the W3C 
  filter: alpha (opacity = 50) // for Internet Explorer 7 and - (if I am not mistaken) 
}

Finally, there's not a worry but normally enough to continue ...

[Modifier]

Because you think IE8 is true to the W3C?

-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";;

[XSI]

I think filter: alpha (opacity = 50); works very well in IE 8

Personally I hate IE, but I had read and heard that it was the standard (not on everything, but on the most stupid thing).