var mess = new Array('<img src="images/1.gif" width="863" height="63">','<img src="images/2.gif" width="863" height="63">','<img src="images/3.gif" width="863" height="63">','<img src="images/4.gif" width="863" height="63">','<img src="images/5.gif" width="863" height="63">');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);