Changing Source Mode to IFRAME

I'm just about to switch my CMS from using DevEdit over to FCKEditor...

I'm working over all the code, and I amy trying to update the system to display my source code in an IFRAME rather than the plain textarea.

my main problem is I'm not too experienced with javascripting on the level that this package was created...

I've edited the html on the fckeditor.html, and added a new file that's almost the same as fckeditorarea.html...

now, I need to be able to update the sections that are document.gettElementbyID("Source").value to something that will work in the IFRAME...

Any help would be greatly appreciated...

my purpose for this is to add a feature rich syntax highlighter...

Also, as a new FCKEditor user, the documentation included with the distribution seems kind of incomplete... are there any other resources out there?