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<html>
<head>
<script language="javascript">
function overlay() {
xyz = document.getElementById("overlay");
xyz.style.visibility = (xyz.style.visibility == "visible") ? "hidden" : "visible";
}
</script>
<style type="text/css">
#overlay {
visibility: hidden;
position: absolute;
left: 0px;
top: 0px;
width:100%;
height:100%;
text-align:center;
z-index: 1000;
background-color:gray;
opacity: 0.8; /*FireFox*/
filter:alpha(opacity=80); /*IE*/
-moz-opacity: 0.8;
}
#overlay div {
width:300px;
 
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