var mess = new Array(

'<img src="http://www.jdmuniverse.com/images/goog1.jpg">',

'<img src="http://www.jdmuniverse.com/images/goog2.jpg">',

'<img src="http://www.jdmuniverse.com/images/goog3.jpg">',

'<img src="http://www.jdmuniverse.com/images/goog4.jpg">',

'<img src="http://www.jdmuniverse.com/images/goog5.jpg">');

var max = mess.length;

var num = Math.floor((Math.random() * max));

document.writeln(mess[num]);