Selecting text in a table with onClick

[RandomWalk]

Thanks to posts by others I think I have only one qestion remaining regarding getting the text from a table with an onclick method. I have a table in an iFrame. One column lists folder names (no path). When the user clicks on a folder name I want to transfer the name to an imput box that belongs to the iFrame's parent but I don't see how to select the text. Here's a snippet from my table (which is generated by a python script):

<tr class="style1">
<td><div align="left" class="style3">Folder0</div></td>
<td><div align="left" class="style3"><div align="center">Old</div></div></td>
</tr>

The text in red is the value I need.
I'm a beginner, BTW.