How do I insert thumbnails using the HTMLAREA module?

Hello,

While playing the round robin of editors for Drupal, we think we hit a winner with Xinha and the HTMLAREA module. The only issue is the inability to place thumbnail images into the posts.

We currently use TinyMCE with ImgASSIST to make this magic happen, but IMGASSIST doesn't work with Xinha.

The only screen we see when adding images is the following:

http://www.jiffle.net/drupaldocs/uploadimage

Somehow you're supposed to be able to get to this screen, but I have no idea how:

http://www.jiffle.net/drupaldocs/imagemanager

Neither option offers the ability to use a thumbnail of the image instead or the whole image.

Is there a way of doing this that I am missing?