Looks good from here...

I just tried your link and saw the document: The linear Algebra. Can you explain how you were expecting it to work?

I just get a white box on the page and it spins forever spewing out JS errors. The status bar says "completed 4 out of 5 items"

Web inspector in safari 4 shows:

Unsafe JavaScript attempt to access frame with URL http://doxela.com/view/1214130930.php from frame with URL https://www.google.com/accounts/ServiceLogin?service=writely.... Domains, protocols and ports must match.

You are trying to do XSS?

This brings up another tip that every developer should know: Make it easy for users to report bugs.

Thank you very much for the report.

That is related to the embed code I am using.

Will try and fix it.