No image browse button - Tiny MCE in Drupal 5

Using the Wysiwyg API to activate Tiny MCE inside Drupal 5 (works great!!!)
http://drupal.org/project/wysiwyg

Also the HTML Purifier module for better control over user input:
http://drupal.org/project/htmlpurifier

When the insert Image icon is clicked inside Tiny MCE, no Browse option is offered so as to reach IMCE. Found this suggestion:
http://drupal.org/node/241753#comment-792305
Which apparently works fantastic inside Drupal 6. Doesn't seem to do anything inside Drupal 5 however. (Yes, I *know* there are significant changes between the two.)

Also tried the option mentioned by hiitsjam@groups... (http://drupal.org/node/234422) about adding this code:

<?php
print $closure 
?>

This is already present in the theme I'm using (variation built on the Pushbutton theme). I see where others are using the Tiny Tiny MCE module to activate the editor rather than Wysiwyg API, but I'd prefer to stick with that as prep for the Drupal 6 upgrade...

Help!