var mess = new Array('<img src="images/monuments/monuments12/1961.jpg" width="450" height="450" />','<img src="images/Blokovi/blockforrand.jpg" width="445" height="563" />','<img src="images/interiors of power/interiors of power 12/Green Chair.jpg" width="579" height="450" />');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);