>>  The only other way (in my scenario) is to add a transparent image 'over'
>> the background to line up with the div - but this is a bit of a
>> 'fudge' and
>> seems a shame when there is code to do the job.
>>  Do you know why it isn't valid?
> 
> No idea. Opera and Safari support the CSS3 recommendation, Mozilla
> also offers an own CSS extension (with a valid -moz prefix). MSIE 6
> needs a Microsoft - only filter specification.

 Firefox 1.5+ also supports 'opacity', no need for the '-moz' anymore.
 Which then leaves MSIE alone. But anyway, MSIE is not interested in any
kind of valid code, so conditional-comments for MSIE-specific CSS comes
to mind:

<head>
        <title>Validates where it should (xml+html), and not where nobody 
cares</title>

        <style type="text/css">
                .fader { opacity: 0.5; }
        </style>

        <!--[if lt IE 7]>
        <style type="text/css">
                .fader { filter: 
progid:DXImageTransform.Microsoft.Alpha(opacity=50); }
        </style>
        <![endif]-->
</head>

 Ciao
        Niels


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