No errors reported but broken images

I can upload images to albums and it works without reporting issues but when i go to look at the album and all the images are broken.

I have installed the product (version 1.5) and i am sure that the albums directory is correct as when i set it wrong it gives me error messages. I have checked the permissions, on both the gallery and the albums directory and they are 777.

I am using PHP as supplied so my hosting company so i am not sure of the exact version. I have installed and used gallery 1.5 before on another website with the same hosting service so i know it works.