Buses from Shanghai to Jiashan/Xitang and back

I need to get info on transportation from Shanghai to Xitang and back same day.

I%26#39;m thinking about an early Saturday afternoon departure from Shanghai, hopefully arrive by late afternoon in Xitang and return to Shanghai late at night.

I read Ellyse%26#39;s link (from virtualtourist) info about Xitang transportation but I noticed, there is no info regarding the return bus schedules from Jiashan/Xitang to Shanghai.

Does anybody know how late the buses run from Jiashan to Shanghai? And also how late those minibuses would run from Xitang to Jiashan? Consider weekend schedules please.