How do I deny users access to plugins

Hello, I'm using New Blog Template with Pro Sites, and have also installed Easy Blogging to lock users out of certain areas. However, I noticed that if my users simple know the url they can access areas that I don't want them to access. For example, they can get to the plugins page simply by adding /wp-admin/plugins.php to the end of their domain. Is there any way to limit this?

Thanks, Chris