var mess = new Array(
'<img src="images/homepageheaders/header1.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header2.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header3.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header4.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header5.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header6.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header7.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header8.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header9.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header10.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header11.jpg" width="784" height="146" alt="" border="0">',
'<img src="images/homepageheaders/header12.jpg" width="784" height="146" alt="" border="0">');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);