var mess = new Array(
'<img height="263" alt="Australia" src="images/random/Australia.gif" width="350" border="0">',
'<img height="225" alt="Timbuktu Camels" src="images/random/timbuktu1.jpg" width="350" border="0">',
'<img height="263" alt="Bosnia" src="images/random/bosnia1.jpg" width="350" border="0">',
'<img height="263" alt="Bosnia" src="images/random/bosnia2.jpg" width="350" border="0">',
'<img height="263" alt="Bosnia" src="images/random/bosnia3.jpg" width="350" border="0">');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);