This (from your source code):
Code:
<script type="text/javascript" src="scripts/prototype.js"></script>
<script type="text/javascript" src="scripts/scriptaculous.js?load=effects"></script>
<script type="text/javascript" src="scripts/frog.js"></script>
is not where these script files are located. You have them in the same directory as the page. So, either make a scripts directory if you do not have one and put them in it, or list them at their current locations on the server in your source code, like so:
Code:
<script type="text/javascript" src="prototype.js"></script>
<script type="text/javascript" src="scriptaculous.js?load=effects"></script>
<script type="text/javascript" src="frog.js"></script>
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