Adding -pass-header HTTP_AUTHORIZATION to vhost.conf

[formasfunction]

I'm running PHP5 on my Plesk 8.0 install as a fastcgi module and I wanted to know how to add -pass-header HTTP_AUTHORIZATION to my vhost.conf file in order to allow my PHP scripts access to HTTP authentication. Here's what my vhost.conf file looks like right now

AddHandler fcgid-script .php .php5 .xml
<Directory /var/www/vhosts/example.com/subdomains/dev/httpdocs>
        FCGIWrapper /opt/php51/cgi-bin/php5 .php
        FCGIWrapper /opt/php51/cgi-bin/php5 .php5
        FCGIWrapper /opt/php51/cgi-bin/php5 .xml
        Options ExecCGI
        allow from all
</Directory>