I think you need to approach this a little different.
Since you may have multiple styles available to your members.
You would make a folder in like:
forums\images\general\forddoctor.
Then select that in the style editor for General images.
If you have other custom styles you will see those folders in the same area.
You may end up with duplicate images but they don't use that much disk space.
The button you reference is:
images/general/default/toggle_open.gif
