Good guess, but the first one is a standard header and the second is I.E. specific. If you combine them then Netscape based browsers ignore the combined header. With them separate Netscape drops the I.E. specific header, but still honors the standard one.

The more I think about this I'm almost positive there isn't a workable solution as even if I can get IE to pull the page from it's history I'm just going to hit another IE specific bug (some versions of IE will randomly clear all form fields when you use the back button to revisit a form). Hmmm...

-Mike