Got osCommerce installed but when I try to go into admin I get this error

[e_a_g_l_e_p_i]

When I try to go into the admin I get this error, currently public_html/catalog/admin/index.php is chmoded to 744, I tried to chmod them to 777 but still got this error. can someone please help me?

 

Warning: main(includes/application_top.php): failed to open stream: Permission denied in /home/playboy/public_html/catalog/admin/index.php on line 13

 

Warning: main(includes/application_top.php): failed to open stream: Permission denied in /home/playboy/public_html/catalog/admin/index.php on line 13

 

Fatal error: main(): Failed opening required 'includes/application_top.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/playboy/public_html/catalog/admin/index.php on line 13