var mess = new Array('<img src="../images/logos_1.jpg" width="180" height="247">','<img src="../images/logos_2.jpg" width="180" height="247">','<img src="../images/logos_3.jpg" width="180" height="247">');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);