code: def iframe_url(target, width=500, height=400, scrolling=True, border=0, frameborder=0):
      
      
      prefix = u"http://" if not target.startswith("http") else u""
      target = prefix + target
      if scrolling:
          scroll_val = 'yes'
      else:
          scroll_val = 'no'
      return u'<iframe frameborder="{frameborder}" scrolling="{scrolling}" style="border:{border}px" src="{url}", width={width} height={height}></iframe>'.format(frameborder=frameborder, scrolling=scroll_val, border=border, url=target, width=width, height=height)
docs: Produce an iframe for displaying an item in HTML window.
      :param target: the target url.
      :type target: string
      :param width: the width of the iframe (default 500).
      :type width: int
      :param height: the height of the iframe (default 400).
      :type height: int
      :param scrolling: whether or not to allow scrolling (default True).
      :type scrolling: bool
      :param border: width of the border.
      :type border: int
      :param frameborder: width of the frameborder.
      :type frameborder: int