var mess = new Array('<img src="images/ADVERTS_public_liaility.jpg" width="196" height="119">','<img src="images/ADVERTS_commercial_business.jpg" width="196" height="119">','<img src="images/ADVERTS_employers_liability.jpg" width="196" height="119">','<img src="images/ADVERTS_Contractors.jpg" width="196" height="119">','<img src="images/ADVERTS_Combined_liability.jpg" width="196" height="119">');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);