// Use as many listings as you want.
var mess = new Array(
'<a href="ads/000007/"><img src="ads/000007/thumb1.jpg" border="0"></a>',
'<a href="ads/000008/"><img src="ads/000008/thumb1.jpg" border="0"></a>',
'<a href="ads/000015/"><img src="ads/000015/thumb1.jpg" border="0"></a>',
'<a href="ads/000016/"><img src="ads/000016/thumb1.jpg" border="0"></a>',
'<a href="ads/000017/"><img src="ads/000017/thumb1.jpg" border="0"></a>',
'<a href="ads/000018/"><img src="ads/000018/thumb1.jpg" border="0"></a>'
);
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);