Code:
<div id="randomLnks">
<a href="someDefault.htm" target="someDefaultTarget"><img src="someDefault.jpg" alt="Some Default Alt Text" title=""></a>
</div>
<script type="text/javascript">
(function(){
var imgLnkTrgs = [], targDiv = document.getElementById('randomLnks').getElementsByTagName('*');
imgLnkTrgs[0] = ['image1.jpg', 'http://www.somedomain.com/', '_blank'];
imgLnkTrgs[1] = ['image2.jpg', 'some.htm', '_self'];
imgLnkTrgs[2] = ['image3.jpg', 'http://www.anotherdomain.com/', '_blank'];
imgLnkTrgs[3] = ['image4.jpg', 'http://www.yetanotherdomain.com/', '_blank'];
imgLnkTrgs = imgLnkTrgs[Math.floor(Math.random() * imgLnkTrgs.length)];
targDiv[0].href = imgLnkTrgs[1];
targDiv[0].target = imgLnkTrgs[2];
targDiv[1].src = imgLnkTrgs[0];
targDiv[1].alt = 'Random Image w/Link';
})();
</script>
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