Random Image Swap with Prototype
A simple example using Prototype to change the banner image upon refresh. This version inserts the banner into the page and displays a default one when scripts are disabled.
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<title>Test</title>
<script type="text/javascript" charset="utf-8" src="http://ajax.googleapis.com/ajax/libs/prototype/1.6.0.3/prototype.js">
</script>
</head>
<body id="mypage">
<div id="banner">
<noscript>
<img src="http://www.uwec.edu/images/experience5_1.jpg" alt="one"/>
</noscript>
</div>
<script type="text/javascript" charset="utf-8">
var images = [["http://www.uwec.edu/images/experience5_1.jpg", "one"],
["http://www.uwec.edu/images/experience4_1.jpg", "two"],
["http://www.uwec.edu/images/experience3_1.jpg", "three"],
["http://www.uwec.edu/images/experience2_1.jpg", "four"]
]
var randomnumber = Math.floor(Math.random()*(images.length))
var banner_div = $("banner");
var image_src = images[randomnumber][0];
var image_alt = images[randomnumber][1];
banner_div.innerHTML = '<img id="banner" src="'
+ image_src + '" alt="' + image_alt + '" />';
</script>
</body>
</html>