Catalog Errors

[oscommerce2006]

I keep getting the following error when i click online catalog:

 

Warning: main(includes/application_top.php): failed to open stream: Permission denied in /home/fhlinux217/u/mywebsite.com/user/htdocs/catalog/index.php on line 13

 

Warning: main(includes/application_top.php): failed to open stream: Permission denied in /home/fhlinux217/u/mywebsite.com/user/htdocs/catalog/index.php on line 13

 

Fatal error: main(): Failed opening required 'includes/application_top.php' (include_path='.:/usr/share/pear') in /home/fhlinux217/u/mywebsite.com/user/htdocs/catalog/index.php on line 13

 

 

I would really appreciate some help.

 

Cheers