Website not displayed correctly

A friend just told me that my website http://www.eskadi.com is not displayed correctly at Safari and Mozilla Browser. I asked him to delete his cache but it still does not work on his Mac. The test I made were all sucessfull so I cannot confirm the issue. He just saw numbers and words without pictures. Then he emptied the cache and now he sees some pictures but it’s still like a mess. Do you have an idea what kind of issue it might be. I think it’s a cache problem.