var mess = new Array(
					 '/images/banners/hkhike.jpg',
					 '/images/banners/fence.jpg',
 					 '/images/banners/field.jpg',
					 '/images/banners/flippy1.jpg',
					 '/images/banners/divide.jpg',
					 '/images/banners/graves.jpg',
					 '/images/banners/ocean.jpg');
var max = mess.length;
var num = Math.floor((Math.random() * max));
str1 = '<img class="banner" src="';
str2 = '">';
document.writeln(str1 + mess[num] + str2);