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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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