need help with aquarium volume calculator

I have a javascript aquarium volume calculator located here http://utahfishkeepers.us/page/volumecalculator. Here is the code:

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="http://www.fishlore.com/scripts/js/share.js"></script>
<script type="text/javascript">
var result = 0;
var roundLength […]

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