or notepad++ - free and open source - the html-code is "highlighted" so you can easily tell the code from the content apart.
<mbp: pagebreak> (Or is it mpb: pagebreak? I can never keep them straight.)
actually, it's <mbp
agebreak/> (you should use the closing / to be correct, but it's not really necessary.
mbp like MoBiPocket, easy to remember