// Use as many listings as you want.
var mess = new Array(
'<a href="ads/000035/"><img src="ads/000035/thumb1.jpg" border="0"></a>',
'<a href="ads/000005/"><img src="ads/000005/thumb1.jpg" border="0"></a>',
'<a href="ads/000006/"><img src="ads/000006/thumb1.jpg" border="0"></a>',
'<a href="ads/000013/"><img src="ads/000013/thumb1.jpg" border="0"></a>',
'<a href="ads/000014/"><img src="ads/000014/thumb1.jpg" border="0"></a>');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);