var mess = new Array(
'<img src="images/featuredprojects/image4.jpg" width="129" height="80" alt="" border="0">',
'<img src="images/featuredprojects/image5.jpg" width="129" height="80" alt="" border="0">',
'<img src="images/featuredprojects/image6.jpg" width="129" height="80" alt="" border="0">');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);