I'm enclosing a marginally updated patch file.
It merely removes a reported bug in IE (and maybe Firefox) that "tinyMCE_GZ" is not found. As we're not using tinyMCE, I've "nulled" that bit of the original script.
People have reported some issues in Firefox, and IE. I've tried it successfully on IE8 and Firefox 3.5. Please report your own successes or failures, either direct to me (preferable), or on here.
Note, as I'm using it on a development site, I don't have CSS or PHP compression or caching enabled. Please try toggling these settings also.
THANK YOU THANK YOU THANK YOU THANK YOU! We have been battling to get this working and your patch worked perfectly. Thank you so much for all the time and effort you spent on this and for sharing it with us!