function pageScroll() {
		var xScroll, yScroll;

		if (self.pageYOffset) {
			yScroll = self.pageYOffset;
			xScroll = self.pageXOffset;
		} else if (document.documentElement && document.documentElement.scrollTop) {
			yScroll = document.documentElement.scrollTop;
			xScroll = document.documentElement.scrollLeft;
		} else if (document.body) {
			yScroll = document.body.scrollTop;
			xScroll = document.body.scrollLeft;	
		}

		return [xScroll, yScroll]; 
	};
	

	function getMaxSize (maxWidth, maxHeight, imageWidth, imageHeight) {
		var r = Math.min(Math.min(maxWidth, imageWidth) / imageWidth, Math.min(maxHeight, imageHeight) / imageHeight);
		return [Math.round(r * imageWidth), Math.round(r * imageHeight)];
	};
	
	
	function scompari(obj){
		$(obj).animate({
			left:700+'px',
			top:270+'px',
			width:0+'px',
			height:0+'px'		
		},'slow','swing', function(){$(this).remove();}).fadeOut('slow');
	}

$(function(){	



	var imgBanner = "http://www.passawind.it/grafica/posta-certificata.png";
	var urlBanner = "#";
	
	var imgW = 357;
	var imgH = 222;
	
	$('body').append('<div id="banner"><div id="close">X</div><a href="'+urlBanner+'"><img src="'+imgBanner+'" alt="*" width="'+imgW+'" height="'+imgH+'" /></a><div class="clear"></div></div>');
	$('#banner').pngFix( { blankgif:'js/blank.gif' } );
	$('#banner').hide();
	
	
	
	var scroller = pageScroll();
	var scrollX = scroller[0];
	var scrollY = scroller[1];
	
	
			
	var widthW  = $(window).width();
    var heightW = $(window).height();
	

	
	var size    = getMaxSize(widthW-50,heightW-100,imgW,imgH);
	var sizeW   = size[0];
	var sizeH   = size[1];


	var itemLeft	= scrollX + Math.round((widthW - sizeW) / 2) - 20;
	var itemTop		= scrollY + Math.round((heightW - sizeH) / 2) - 40;
	
	


	$('#banner').css({'position':'absolute','top':itemTop+'px','left':+itemLeft+'px','z-index':9000000});
	$('#banner').fadeIn('slow');
	
	
	
	$('#close').click(function(){
		$(this).parent().remove();
	});
	
	setTimeout("scompari($('#banner'))", 12000);
});