Bookstore Website is not being refreshed automatically

Hi everybody,

I am running a small bookstore and having website for that. I used to upload latest images and new books into that. On my computer it shows the latest images, whatever I have uploaded.

But in one of my friend's computers this website is showing the old photos only. I am updating those photos and all by using Earth Link center. I could not understand that this problem is related to HTML or some cache issue? On my website, I don't like to keep the Refresh button to update the page with the latest items. It has to update website automatically whenever we make changes.

Can somebody please give me the best solution that the views has to see the latest webpage of my bookstore. Thanks a lot in advance and regards.