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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Overlay- bY Targetweb.it</title>

<style>

#contenuto{ width:100%; height:100%; margin:15px;}

.apri1{ font-size:18px; font-family:Verdana, Geneva, sans-serif; float:right; margin-right:50px;}
.apri1:hover{ font-size:22px; font-family:Verdana, Geneva, sans-serif; cursor:pointer;}
.chiudi{ font-size:18px; color:#000; font-weight:bold; position:absolute; right:2%; top:0%;  cursor:pointer;}

.overlay{
    background:#000;
    position:fixed;
    top:0px;
    bottom:0px;
    left:0px;
    right:0px;
    z-index:100;
	cursor:pointer;
/*Trasperenza cross browser*/
opacity: .7; filter: alpha(opacity=70); 
-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=70)";	
	
}

#box{ width:600px; height:400px; background-color:#FFF; display:none; z-index:+300; position:absolute; left:30%; top:20%; -moz-border-radius: 15px;  -webkit-border-radius: 15px;
border-radius: 15px;}

</style>

$(".apri1").click(
	    function(){
			$('#overlay').fadeIn('fast');
			$('#box').fadeIn('slow');
		});
		
		$(".chiudi").click(
	    function(){
		$('#overlay').fadeOut('fast');
		$('#box').hide();
		});
		
		//chiusura emergenza 
		$("#overlay").click(
	    function(){
		$(this).fadeOut('fast');
		$('#box').hide();
		});
		
	
        
   });     
        
 </script>

</head>

<body>

<div id="box">adasd
		<p class="chiudi">X</p>
</div>

<div id="contenuto">
        
       
        asdasdasdasdsd
        <p class="apri1"> &raquo; APRI L'OVERLAY</p>
        
      
        
		
        
		</div>

</body>
</html>

Editing File: overlay.html