Any issues with using innerHTML to load up an iframe?

My app (under development) uses Safari 4.0.3 and JavaScript to present its front end to the user. The backend is PHP and SQLite. This is under OS X 10.5.8. The app will from time to time receive chunks of HTML to present to the user. Each chunk is the body of an email received, and as such one has no control over the quality of the HTML received. What I do it use innerHTML to shove the chunk into an iFrame and let Safari render it. To do that I do this: window.frames["mainwindow"].window.frames["Frame1"].document.body.innerHTML = myvar; where myvar contains the received HTML. Now, for the most part this works as desired, and the HTML is rendered as expected. The exception appears to be when the tag for the chunk looks like:

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