i think the problem was he missed out the '( )', so therefore javascript wouldnt have seen the XMLHttpRequest class (in javascripts case, a function) and was looking for a var called XMLHttpRequest, it created the object but it didnt have the 'open()' method defined (once again function in the world of OO JS).

Im no expert in javascript but thats what i think he did wrong.

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mysql> SELECT * FROM `users` WHERE `users`.`clue` > 0;
Empty set (0.00 sec)