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Yesterday sr_erick posted this on oxle: http://oxle.com/topic.asp?tid=4996
The database has two tables, one for topics, one for posts. The topics table has the forum ID and the user ID, along with the title, description, posts, saved date, and a bit field to show if it was autosaved or not. The one for posts is the same...except it has a topic ID, not forum ID and it doesn't have a title or description field.<
Ajax does all the saving, when the page is reloaded, the database is checked for a draft. It works pretty much the way you thought. None of it was really a challenge but I've learned lots about javascript since working on this new site code so it's getting quite a lot easier.