Login Images

I am creating a website that uses forms based authentication. On the login page I have two images. These images have the red X when I first go to the login page. If I login successfully I get redirected to my welcome page. If I hit the back button and view the login page the images show up. How do I get the images to show up before the user logs in?

Are they in a directory that you have user or role based permissions on? I'd bet they are.