fine tune ie8 sheettab css
Bug fixed: ZSS-716 Insert function which takes no arguments by "Insert Function" dialog will get wrong formula
http://tracker.zkoss.org/browse/ZSS-716
Merge pull request #37 from RaymondChao/ZSS-716

Bug fixed ZSS-716: Insert function which takes no arguments by "Inset Function" dialog will get wrong formula