I think, i requested lot of things already...
This s a bit different from preview, no one(forum) s having this option.
* is it possible to show online preview, while typing the letters itself. I mean, while writing/tryping subject, forum should show preview(one by one letter).
I think, everyone got it, sorry for my bad english
in this case I think WYSIWIG would be much better, so you needn't an additional area for the preview