Try this:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<noscript><img src="files/1_side.jpg"></noscript>
<script type="text/javascript">
function robin(){
//Set Your Images in the below Array:
var robin_im=['files/1_side.jpg', 'files/2_side.jpg', 'files/3_side.jpg', 'files/5_side.jpg', 'files/8_side.jpg']
//set the links in the below Array:
var robin_link=['about.html', 'test.php', 'files/3_side.jpg', 'files/5_side.jpg', 'files/8_side.jpg']
//////////////// Stop Editing //////////////////
function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}
function eraseCookie(name) {
createCookie(name,"",-1);
}
var num=readCookie('robim')? readCookie('robim')*1 : 0;
document.write('<a href="'+robin_link[num]+'"><img src="'+robin_im[num]+'"></a>')
num=num<robin_im.length-1? num+1 : 0;
createCookie('robim', num);
}
robin();
</script>
</body>
</html>
Hope this helps.