Cache problems Options

[TomKimball]

Hi: I built a simple website with HTML on Yahoo Web Hosting. I have several cameras that FTP images to the server and these images are displayed on various web pages. They have been working fine for many years, save that one must refresh the page to see the latest image. Lately, the image cannot be refreshed on the page unless I use a control+f5 refresh. A simple refresh will no longer work. When I contacted customer support they were unhelpfull. Basically telling me to just clear my cache. This does not work. And I know of no way to do a hard refresh on an ipad, so using that is useless to view the site.
I have tried several meta tags to get the page not to cache, but they do not work for me. And I'm not sure if that's the problem, since clearing the cache doesn't work anyway. What's weird to me is that if anyone on my network or any network, does a control+f5 refresh, I am able to see that picture with a simple refresh on my computer. Hope this makes some sense.
Are there meta tags or html code that can force a page to do a control +refresh??? Any ideas would be appreciated, thanks. Here is a page on a site with a camera image. The image is updated every 15 seconds, so you can tell if the picture is new if the flag moves. http://fiskcam.com/fisklake.html
Thanks in advance for any help.