var mess = new Array
(
'<img src="images/760_randompan_01.jpg" width="760" height="110" alt="" border="0">',
'<img src="images/760_randompan_02.jpg" width="760" height="110" alt="" border="0">',
'<img src="images/760_randompan_03.jpg" width="760" height="110" alt="" border="0">',
'<img src="images/760_randompan_04.jpg" width="760" height="110" alt="" border="0">',
'<img src="images/760_randompan_05.jpg" width="760" height="110" alt="" border="0">'
);
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);