Il seguente codice in IE9, in particolare la classe BLACK_OVERLAY non prende il 100% della larghezza con il grigio opaco designato nella classe (in sostanza rimane un 5px circa scoperti).. in firefox invece funziona correttamente.

Qualcuno sa dirmi perchè?
grazie

<style>
.black_overlay{
display: none;
position: absolute;
top: 0%;
left: 0%;
width: 100%;
height: 100%;
background-color: black;
z-index:1001;
-moz-opacity: 0.8;
opacity:.60;
filter: alpha(opacity=60);
}
.white_content {
display: none;
position: absolute;
top: 25%;
left: 25%;
width: 690px;
height: 434px;
padding: 0px 0px 0px 0px;
margin: 0px 0px 0px 0px;
border: 0px solid orange;
/*background-color: white;*/
z-index:1002;
overflow: auto;
}
</style>

<div id="light" class="white_content">
<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,24" width="690" height="430">
<param name="movie" value="file.swf" />
<param name="quality" value="high" />
<param name="menu" value="false" />

<object data="file.swf" width="690" height="430" type="application/x-shockwave-flash">
<param name="quality" value="high" />
<param name="menu" value="false" />
<param name="pluginurl" value="http://www.macromedia.com/go/getflashplayer" />
FAIL (the browser should render some flash content, not this).
</object>

</object>
</div>

<div id="fade" class="black_overlay"></div>
</DIV>