// Use as many listings as you want.
var mess = new Array(
'<a href="ads/000060/"><img src="ads/000060/thumb1.jpg" border="0"></a>',
'<a href="ads/000001/"><img src="ads/000001/thumb1.jpg" border="0"></a>',
'<a href="ads/000002/"><img src="ads/000002/thumb1.jpg" border="0"></a>',
'<a href="ads/000009/"><img src="ads/000009/thumb1.jpg" border="0"></a>');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);