[xmonad] a layout changing menu

Hi, It would be cool to have a keybinding which popups a menu from which one can change the current layout by another key press. I guess, for this an extern menu-program is needed. But hey, there is dmenu. So is it possible to start dmenu from xmonad and based on its output, change the current layout? I do not know any haskell, so if it is not to much trouble, a skeleton code would be cool :). Thanks! Nathan