Originally Posted by vinaytp
Just Create a directory under /var/www/html say Centos, as it is default DocumentRoot for sharing your installation media.
As you have kept the Installable at /var/ftp/pub. Just create a soft link from /var/ftp/pub to /var/www/html/Centos.
ln -s /var/ftp/pub /var/www/html/Centos
Sorry, but this is incomplete advice.
Unless Apache has been set up to explicitly allow symlinks, making one as you suggested won't work, since Apache won't follow it (for security reasons). Also, the DirectoryIndex directive has to be set to point to the folder(s), to allow a listing to be made at ALL, even if symlinks are allowed.