I've used the markitup library for the Rich text editor for my project.
However I need to make it in live editing mode which I mean, when I type a text then make a selection Bold, Italic or Strike-out it would render directly in the textarea
without have to do a preview.
Something like with MS Word of Open Office Writer.
Checking with Firebug, markitup injects a iframe
to do "preview" the text.