Problem Validating Joomla for XHTML

[digidrum]

Hello,
My Joomla install is not validating XHTML and I am trying to fix it, error by error.
The URL separators are causing many errors.

PHP.ini arg_separator.output = &

I am trying to change the & to something else as discussed here:
http://www.w3.org/QA/2005/04/php-session

I've tried tweeking the php.ini and/or the htaccess.txt
with
arg_separator.output = "&"
or arg_separator.output = ";"

I see that the some of the links in the index.php are hard coded as such. I even changed any I could find to "&"
Won't work as URLs

Anyone seen the solution around?

Thanks in Advance