How to install
1. Include the following files before body tag close.
<link href="path_to/jcalculator.css" rel="stylesheet" type="text/css">
<-- jQuery library -->
<script type="text/javascript" src="path_to/jquery.js"></script>
<script type="text/javascript" src="path_to/jcalculator.min.js"></script>
2. Call the jCalculator plugin.
<script type="text/javascript">
$('#yourInput').calculator();
</script>