I'm trying to make my Silverstripe theme XHTML Strict W3C compliant. However _target is not allowed, the easy fix for this is to change this to rel="external" and let a js do the legwork. However i have to change the way the WYSIWYG editor adds external pages. I have to change that from _blank to rel=external.
Does anyone know where to find the line to edit this, i have checked around and found some JS files wich did some of the WYSIWYG code but couldnt find it so far..