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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
​
<input type="text" id="serial" />
  
</body>
</html>
 
$(document).ready(function() {
  
document.getElementById('serial').addEventListener('keyup', function (e) {
    var value = this.value;
​
    // 17 is the max length of the serial XX-XX-XX-XX-XX-XX-XX
    if (value.length < 17) {
        if (value.length %6 == 4 && value.substr(value.length-1,1) !== "-") {
            this.value = this.value + '-';
        }
    }
}, false);
​
​
});
Output

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