Problem with running PHP4 on CentOS5

Following the instructions on http://wiki.conforge.com/wiki/Linux-PHP4cgiAndPHP5on+CentOS5 I have installed PHP4 on CentOS5, which already had PHP5.2. The installation process went smooth, phpinfo() confirms that PHP4 has been installed successfully. However, when I try to install Drupal 5.8 in one of the virtual servers which is configured to run under PHP4, then it redirects me to http://mysite.com/php-bin/install.php, thought it was supposed to redirect to http://mysite.com/install.php. So it somehow adds extra /php-bin/ in the path.

I have the following configuration in /etc/httpd/conf/httpd.conf:

ScriptAlias /php-bin/ /opt/php4/bin/
SetEnv PHPRC “/opt/php4/bin”
Action php4-script “/php-bin/php4-cgi”
AddHandler php4-script .php

as it was instruction on the above mention page. I can’t figure out what I must change for it to work correctly. Could anyone, please, suggest any solution to this? Thanks!