[xmonad] Move focus to the next window across multiple visible workspaces

Hi, I use a multi-head display with xmonad, and I'd like to cycle through all the windows on both visible workspaces. I've tried using XMonad.Layout.WindowNavigation, but I can't seem to get it to work. It doesn't switch focus across workspaces, and the more positional L, R, U, D is really not what I'm looking for. I'd like to have it simply cycle through all the windows in both workspaces, regardless of their position relative to each other. Thank you in advance, -- "I know you think you understand what you thought I said but I'm not sure you realize that what you heard is not what I meant" -- Alan Greenspan