//var mess = new Array('<img src="images/graphics/adverts/1.jpg" width="600" height="300" border="0" />','<img src="images/graphics/adverts/2.jpg" width="600" height="300" border="0" />', '<img src="images/graphics/adverts/3.jpg" width="600" height="300" border="0" />','<img src="images/graphics/adverts/4.jpg" width="600" height="300" border="0" />','<img src="images/graphics/adverts/5.jpg" width="600" height="300" border="0" />','<img src="images/graphics/adverts/6.jpg" width="600" height="300" border="0" />');
var mess = new Array('<img src="images/graphics/adverts/6.jpg" width="600" height="300" border="0" />');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);