That looks like a job for Javascript (good luck! I use it as little as I can)

I use a bit of it but I don't like it. I've spent all today trying to find a WYSIWIG editor to replace the TinyMCE one I'm using. One of my problems with that one is that formatting a section with pre does not result in text displayed with a fixed width font. So far I haven't found one that really works as I'd like.

Maybe I could write my own using an iFrame, maybe not but I'm sort of defeated before I even start as most code of more than a couple of lines I've ever looked at seems to have to go about things in different ways for different browsers - even for different versions of the same browser.

I gather a way round it is to use a framework like JQuery but I don't think want to get involved with that. Except I did look at Google Web Toolkit a couple of weeks ago. I installed that onto Eclipse, tried the demo. It all but locked my PC up for 15 minutes or more building the demo program and just it's presence slows everything else down when Eclipse is loaded - maybe 2Gb RAM isn't enough for it or maybe an Athlon 64 X2 6000 isn't up to the job. I don't know but I don't want to upgrade my PC at the moment.