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The follow CSS code ul.dropDown ul { height: expression(this.scrollHeight > 120 ? "120px" : "auto"); } the line starting with height: is marked as an error in the editor. But to my knowledge this is valid CSS (at least it is recognized correctly by FF and IE) It also breaks the Navigator display. Anything after the 120 is no displayed there (the last entry in the Navigator is "120 ?" - without the quotes)
The code is not valid css according to the spec, check on http://jigsaw.w3.org/css-validator/. OTOH I admit we should support also this non-spec extenstions.
*** This issue has been marked as a duplicate of 110333 ***