The files under /var/www/html/webswf must be visible to the user under which you web server runs. To know this user and group (usually nobody.nobody, wwwrun.www or apache.apache), check your operating system manual or try ps aux | grep httpd.

If we assume here that the server runs as wwwrun.www, enter the following commands: chown -R wwwrun.www /var/www/html/webswf, then check that folders are readable and that the folders storage and tmp are also writeable. Making things short, permission can be set with: chmod -R ug+rwx /var/www/html/webswf.