opacity problem in ie8

hi
can anyone tell me why the opacity is not working in ie8 from the code attached. should it work? thanks
#popup {
height: 100%;
width: 100%;
background: #000000;
position: absolute;
top: 0;
-moz-opacity:0.75;
-khtml-opacity: 0.75;
opacity: 0.75;
filter:alpha(opacity=75);
}

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peter_coopAsked:
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Matthew KellyCommented:
Internet explorer 8 does opacity a little different than IE7 or the CCS2 standard: http://blogs.msdn.com/b/ie/archive/2008/09/08/microsoft-css-vendor-extensions.aspx


A blog explaining it: http://realtech.burningbird.net/graphics/css/opacity-returns-ie8
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peter_coopAuthor Commented:
thanks you for links matthew and seems to be a common problem. however i have tried fixes but still no opacity. so will keep trying to find solution. many thanks
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peter_coopAuthor Commented:
thank you
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