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.

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.