I want to correct my initial take above. The JavaScript code I was looking at actually appears to show/hide children in threads. The indentation appears to be

I want to correct my initial take above. The JavaScript code I was looking at actually appears to show/hide children in threads. The indentation appears to be handled separately by invisible GIFs: <td class="ind" indent="0"> <img src="s.gif" height="1" width="0"> </td> <td class="ind" indent="1"> <img src="s.gif" height="1" width="40"> </td> <td class="ind" indent="2"> <img src="s.gif" height="1" width="80"> </td>