When I click on the S and D buttons with Firefox 3.6.3 nothing happens. The error console reports change_Image not defined and showDetails not defined.
Also
Error: [Exception... "'JavaScript component does not have a method named: "handleEvent"' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x80570030 (NS_ERROR_XPC_JSOBJECT_HAS_NO_FUNCTION_NAMED)" location: "<unknown>" data: no]
Cannot reproduce (Firefox 3.6.4 on Windows Vista). Please clear your browser cache and try again.
My Firefox upgraded itself to 3.6.4 and it is now working for me.