var mess = new Array('<img src="http://www.stalbansstriders.com/images/indeximages/f1.jpg" border="0" />','<img src="http://www.stalbansstriders.com/images/indeximages/f2.jpg" border="0" />','<img src="http://www.stalbansstriders.com/images/indeximages/f3.jpg" border="0" />','<img src="http://www.stalbansstriders.com/images/indeximages/f4.jpg" border="0" />');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);