var css=new Array()

css[0] = "images/policy1.jpg";
css[1] = "images/policy2.jpg";
css[2] = "images/policy3.jpg";
css[3] = "images/policy4.jpg";
css[4] = "images/policy5.jpg";
css[5] = "images/policy6.jpg";

var rnd=Math.floor(Math.random()*css.length)
document.write('<img src="'+css[rnd]+'" width="800" height="280">');