def google_analytics_js(parser, token):
    """
    Google Analytics tracking template tag.

    Renders Javascript code to track page visits.  You must supply
    your website property ID (as a string) in the
    ``GOOGLE_ANALYTICS_JS_PROPERTY_ID`` setting.
    """
    bits = token.split_contents()
    if len(bits) > 1:
        raise TemplateSyntaxError("'%s' takes no arguments" % bits[0])
    return GoogleAnalyticsJsNode()
Google Analytics tracking template tag.

    Renders Javascript code to track page visits.  You must supply
    your website property ID (as a string) in the
    ``GOOGLE_ANALYTICS_JS_PROPERTY_ID`` setting.