var mess = new Array('<img src="images/banner_image1.jpg">',
      			     		'<img src="images/banner_image2.jpg">',
      			     		'<img src="images/banner_image3.jpg">',
      			     		'<img src="images/banner_image4.jpg">',
							'<img src="images/banner_image5.jpg">',
							'<img src="images/banner_image6.jpg">',
							'<img src="images/banner_image7.jpg">',
      			     		'<img src="images/banner_image8.jpg">');
	var max = mess.length;
	var num = Math.floor((Math.random() * max));
	document.writeln(mess[num]);