Thank everybody!! I finally found the cause of this problem! It's casused by the Encoding method of I.E. The javascript pull-down menus work incorrectly in Chinese-Traditional Environment!! Just change the Encoding method to English... Thanks a lot!!
In my IE, the pull-down menu of unattended.msfn.org looks like below: And, also unavailable... Could anyone tell me, what is the problem with that ? Thanks a lot!!