jquery.override.js

(function($) {
	$.override = function(target, copy) {
		$.each(copy, function f(k, v) {
			if (v === null)
				delete target[k];
			else if (typeof v == 'object') {
				target[k] = target[k] || ($.isArray(v) ? [] : {});
				var _target = target;
				var _copy = copy;
				target = target[k];
				copy = copy[k];
				$.each(v, f);
				target = _target;
				copy = _copy;
			}
			else
				target[k] = v;
		});
	};
})(jQuery);