preserving post text on error

[ice9]

My users are getting frustrated when they type in a long post, submit it, and then "lose" it because they got a standard posting error (attachment upload error, too many smilies, etc.).

Is there a way to preserve the posting text during the submit process, so that it isn't lost if the user gets an error?

[Merlin_]

In my experience, if you hit 'Back' the post text is still there.

[JulianD]

Sometimes (specially under IE) when you hit back the text is all gone.

[ice9]

The back button works on my personal computer setup, but it doesn't work for many of my users.