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Be aware that you won't be able to modify the headers in this manner. It only matters if you're trying to do mouseovers or something similar and need javascript in the headers.
I'm curious about this response as the original post request is possible but as I'm guessing you're trying to point out, only if you're not wanting to include anything that needs to be in the header.
Javascript does not need to exist in the header to work as it'll survive quite nicely in the body of the text. There are issues if you're using a browser that qualifies as ancient however so you do need to use comment tags to protect against that issue.
Hope that helps