Changing the url and using ajax should be done thoughtfully. For example, you if you have separate content, then it would be a good idea to refresh the page. If you are only showing 50 table entries at a time, then ajax/hash would be the best way to go. Remember, people don't hate refreshing for new content, and it is important to not ajax everything. Be sensible in the division. I refer you to some code I wrote a long time ago to handle basic history, but since it was so troublesome, I didn't make the script work with IE. (http://www.sunsean.com/Jistory/) Feel free to use this as a reference. I'm not sure I answered anyone's question... but hopefully that helps. =)
~Sean
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