Typekit in TinyMCE

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Hi there,
I want to integrate Typekit fonts in the TinyMCE Editor, that means, the fonts should already be used in the editor window. From what I understand, the Editor window opens up in an iframe. I found this instructionhttp://recklessrecursion.com/2010/10/05/typekit-and-tinymce/...
with code, which should go in the head of the document, wich will be inside the iframe.
My Problem is, I cant find this document. Can anybody help me?
I dont know what to do with this instruction in my case.
I created a class in typography.css, which i can choose from the dropdown menu in the editor window. This class should then apply a font from my kit, and I can see the font in the editor window.
I really hope somebody can help me.
thanks and best regards, John