var randomnumber=Math.floor(Math.random()*8);


				var ar = new Array(
				"<img src='head.jpg' alt='Tipologica' width='780' height='260'>",
				"<img src='head2.jpg' alt='Tipologica' width='780' height='260'>",
				"<img src='head4.jpg' alt='Tipologica' width='780' height='260'>",
				"<img src='head5.jpg' alt='Tipologica' width='780' height='260'>",
				"<img src='head6.jpg' alt='Tipologica' width='780' height='260'>",
				"<img src='head2.jpg' alt='Tipologica' width='780' height='260'>",
				"<img src='head4.jpg' alt='Tipologica' width='780' height='260'>",
				"<img src='head7.jpg' alt='Tipologica' width='780' height='260'>"
					);