That does the trick -- but Prissi is right that the visual editor has some odd bugs.
I have tried VBulletin and it has the same problems. I'm not sure about phpBB.
But I have an idea: you can disable the visual editor by clicking on
(not available on the Quick Reply), it's the last button from the left to the right. You can edit the plain text and add formatting tags manually, in the old fashion.
* IgorEliezer ninja'd by TurfIt.