Apache + EP6.0 Rewriting URL's

Hi,

Currently we have been using EP5.0 with an Apache service using mod_prox_html to generate relative links to external site.

Example http://portal.sap.com with a link to http://intranet.portal.sap.com would actually be rewritten as http://portal.sap.com/intranet

Since the code in EP6.0 is not W3C compliant it means that when the code is rewritten the pages fail as the code was not valid from the start.

Has anyone had this problem? or anyone aware of another method of achieving the same results?

Many Thanks and will award points for helpful advice.