Различна картинка при всяко презареждане - Javascript
Пример:
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1251" />
<script type="text/javascript">
var images = new Array();
images[0] = "image1.jpg";
images[1] = "image2.jpg";
images[2] = "image3.jpg";
function randomImage() {
var i = Math.floor(Math.random()*images.length);
document.images['randomImage'].src=images[i];
}
</script>
</head>
<body onload="randomImage()">
<img src="" name="randomImage" alt="" />
</body>
</html>