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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def load_js(js_url=None, version='5.2.0'):
 """Load Dropzone's js resources with given version. .. versionadded:: 1.4.4 :param js_url: The JS url for Dropzone.js. :param version: The version of Dropzone.js. """

        js_filename = 'dropzone.min.js'
        serve_local = current_app.config['DROPZONE_SERVE_LOCAL']

        if serve_local:
            js = '<script src="%s"></script>\n' % url_for('dropzone.static', filename=js_filename)
        else:
            js = '<script src="https://cdn.jsdelivr.net/npm/dropzone@%s/dist/%s"></script>\n' % (version, js_filename)

        if js_url:
            js = '<script src="%s"></script>\n' % js_url
        return Markup(js)