I figured out how to add the Marked All Folders As Read icon to the footer of the active.asp page. Here is what I did:
1. Open active.asp (be sure to make a backup first, in case you mess up).
2. Look for:
" <p><font face=""" & strDefaultFontFace & """ size=""" & strFooterFontSize & """>" & vbNewLine & _
3. Add this underneath:
" " & getCurrentIcon(strIconTopicAllRead,"Mark all topics as read","align=""absmiddle""") & " Mark all topics as read.<br />" & vbNewLine &_
That's it!
If you would like to see what it looks like, you can view my active page here.