var mess = new Array('<img border="0" src="welcome01.jpg">','<img border="0" src="welcome02.jpg">','<img border="0" src="welcome03.jpg">','<img border="0" src="welcomeJOH01.jpg">','<img border="0" src="welcomeWT01.jpg">','<img border="0" src="welcomeWT02.jpg">');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);