In realtà ho trovato questo script su internet. Non sono molto pratico comunque di questa tecnologia.
Cmq il codice è :

codice:
	
	<script type="text/javascript" src="http://cdn.jquerytools.org/1.2.6/full/jquery.tools.min.js"></script>
	 

	
	

	<link rel="stylesheet" type="text/css" href="http://static.flowplayer.org/tools/css/overlay-apple.css"/>
	
	
	<style>
	
	
	
	#apple {
		background-image:url(http://static.flowplayer.org/img/overlay/apple.png);
		color:#fff;
		padding:50px 70px;
	}
	</style>



<script type="text/javascript">

  
	scrolldelay2 = setTimeout("operazioni2()",10000); // scrolls every 100 milliseconds

	function operazioni2()
	{
		window.scrollTo(0,7000); 
		clearTimeout(scrolldelay2); 
		attivaFinestra();
		
	}

function attivaFinestra(){
	// What is $(document).ready ? See: http://flowplayer.org/tools/document...document_ready
	$(document).ready(function() {
	
	// select the overlay element - and "make it an overlay"
	
	
	$("#apple").overlay({

		// custom top position
		top: 150,

		// some mask tweaks suitable for facebox-looking dialogs
		mask: {

			// you might also consider a "transparent" color for the mask
				color: '#fff',

			// load mask a little faster
			loadSpeed: 200,

			// very transparent
			opacity: 0.5
		},

		// disable this for modal dialog-type of overlays
		closeOnClick: false,

		// load it immediately after the construction
		
				
		
		load: true
	});
});
}