[Xmonad] How to make mouse follow focus?

It would be easy to do selection and paste with the mouse if it's near the window with focus. Perhaps making the mouse move to the upper right corner of the window, when every time focus changes, is a good way to go? If I understand it correctly, I probably need to do something with the layoutHooks? Please help me to figure out how to achieve this, thanks. Xiao-Yong -- c/* __o/* <\ * (__ */\ <