rleaved 2 of 5 Barcode Generator</h1>
<div id=user_in>
<input type="text" placeholder="enter an even number of decimal digits...">
</div>
<div id=barcode></div>

<script type=text/python>

from browser import document

def render(event):

    """This function converts its input, a string of decimal digits, into a
    barcode, using the interleaved 2 of 5 format. The input string must not
    contain an odd number of digits. The output is an SVG string.

    Wikipedia [ITF Format]: http://en.wikipedia.org/wi