var mess = new Array
(' <img src="images/quote_1.gif"/>',
 ' <img src="images/quote_2.gif"/>',
 ' <img src="images/quote_3.gif"/>',
 ' <img src="images/quote_4.gif"/>',
 ' <img src="images/quote_5.gif"/>',
 ' <img src="images/quote_6.gif"/>');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);