[UKBusinessLive]

Make the changes below in each of these two templates:
Showthread Templates -> showthread_quickreply
Postbit Templates -> postbit_quickedit

Find this:

<td><div class="imagebutton" id="{$editorid}_cmd_wrap0_quote"><img src="$stylevar[imgdir_editor]/quote.gif" width="21" height="20" alt="$vbphrase[wrap_quote_tags]" /></div></td>

and Add below it:

<td><img src="$stylevar[imgdir_editor]/separator.gif" width="6" height="20" alt="" /></td>
<td><a href="#" onclick="vB_Editor['$editorid'] ENTER YOUR LINES OF CODE HERE; return false">
<img src="$stylevar[imgdir_editor]/Graphic.gif" alt="graphic" border="0" /></a></td>

this will make a Button where you ask, But you'll have to play around with the code abit to try and get it to do what you want, let me know how you got on.

You'll need to replace the graphic.gif to an image that you want to use and uploaded onto your server