How to display several url links in message pane header?

I found only control for displaying one 开发者_如何学Pythonlink. And when it is displaying it is empty, although the cursor looks like there is indeed the link underneath.

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It turns surprisingly simple. There can be used "grid" with row of several mail-urlfields. To do the link not empty the code

gMessageListeners.push({      
  onEndHeaders: function ()
  {          
      var elem3 = window.document.getElementById("my_header_value_Label3");
      elem3.headerValue= my_url;
  }

should be used.