[JavaScript] how to implement Really simple history for bookmark handling in ajax-app

i've tried to implement the example of Really Simple History library given by O'reilly,
but it does'nt work.
So,Please give me explanation about what rsh.js and
json2007.js for???
And what different between dhtmlHistory.js (in RSH old version)and rsh.js (in RSH newest version)????

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