>         var BreadCrumbMM = new GMarkerManager(map, BreadCrumbMMOptions);

BreadCrumbMM is a marker manager object, with methods etc.  I doubt it
has a .length method or property; it just is not a simple array.

The GMarkerManager has been deprecated for some time now (it's not in
current documentation), in favour of the add-on MarkerManager; see
note here
http://googlemapsapi.blogspot.com/2006/11/marker-manager.html

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