"Object doesn't support this property or method"

Does anybody have an tips on solving this VERY GENERIC IE error?

I know a lot of you are going to be thinking “Well, maybe if we had more info…” but seriously, that’s all the info I have.

Line: 2
Char: 12055
Error: Object doesn't support this property or method
Code: 0
URL: http://dev.bluemillmedia.com/admin/blog/newpost

Everything works great in FF (what else is new) and Safari and Opera, but of course not in IE7. I really have no idea where to go with this, other than to spend several MORE hours Googling the issue…

Also, I’ve got MultipleIEs installed and THE GOOGLE HOME PAGE of all places throws the same fricken’ error in IE6.

In IE6 the error for my page is as follows:

Line: 2
Char: 91368
Error: 'nodeName' is null or not an object
Code: 0
URL: http://dev.bluemillmedia.com/admin/blog/newpost

I can’t post any code blocks because I literally have no clue where the error is coming from.

** UPDATE:**

I’ve concluded that the error is not in any of my included scripts, as I only get the error on that one page of my site, and no others (every page shares a template header with included scripts).

** UPDATE #2:**

Problem lies with the embedded instance of TinyMCE. The TinyMCE script itself doesn’t throw the error, but if a textbox is converted, it throws the error…wha?