I am sure you can convert the png images to gif images yourself with any number of free or commercial image editors. Just replace occurrences of the old file extension with the new extension in the code.
Thanks for this; I was just about to create my own subscript and superscript buttons, and I thought I should check here to see if anyone had anything already done. I manually coded in sub/sup icons many versions ago, but updates always wipe my changes. It's nice to have a mod that takes care of all the work.
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