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Your code is relying on the event.target[11] property of an event object, most likely in combination with event delegation, where one single event handler is bound to a container and it manages a variable number of descendant elements.
[11] http://docs.jquery.com/Events/jQuery.Event#event.target
In some cases, you don’t seem to be getting the expected behavior. event.target is sometimes pointing to an element that is inside the one you expected.