div#LeadCertificateOverlay { position: absolute; z-index: 7000; top: 0px; left: 0px; width:1680px; height:1200px; background-color:#000000; filter:alpha(opacity=50); -moz-opacity: 0.50; opacity: 0.50;}
#LeadCertificateOverlay[id]{ position: fixed; }    

div#LeadCertificate { position: absolute; z-index: 8000; top: 100px; left: 25%; width: 50%; height: 50%; }