var mess = new Array('<img src="images/header1.jpg">','<img src="images/header2.jpg">','<img src="images/header3.jpg">','<img src="images/header4.jpg">','<img src="images/header5.jpg">','<img src="images/header6.jpg">','<img src="images/header7.jpg">','<img src="images/header8.jpg">','<img src="images/header9.jpg">','<img src="images/header10.jpg">','<img src="images/header11.jpg">','<img src="images/header12.jpg">','<img src="images/header13.jpg">','<img src="images/header14.jpg">','<img src="images/header15.jpg">','<img src="images/header16.jpg">','<img src="images/header17.jpg">','<img src="images/header18.jpg">','<img src="images/header19.jpg">','<img src="images/header20.jpg">','<img src="images/header21.jpg">','<img src="images/header22.jpg">','<img src="images/header23.jpg">','<img src="images/header24.jpg">','<img src="images/header25.jpg">','<img src="images/header26.jpg">','<img src="images/header27.jpg">','<img src="images/header28.jpg">','<img src="images/header29.jpg">','<img src="images/header30.jpg">','<img src="images/header31.jpg">');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);