page refresh on back/forward button on submit pages

Hi,

I'm not sure what exactly is causing this, whether it's by design, to do with caching or something else.

When writing a new post or comment, if you click the back button (say to check what someone was saying in the thread as you compose the post), then click forward back to your comment, the page refreshes and the form data disappears.

I know this doesn't occur in all CMS software, and if possible I'd like to stop it from happening (so back and forward just use the browser cache)- especially since it must use additional cpu/bandwidth as well to server all those refreshed pages.

Is it possible to switch it off somewhere easily?