[dwm] how can I start such a urxvt?

hello, for some reason, I want to start a special urxvt. urxvt starts at
~/ by default as you know, but I want to start a urxvt which starts at
~/doc/, in fvwm, I can achieve it by edit .fvwm2rc:
        Key F2 A 4 Exec exec $(cd ~/doc && urxvtc)
So I have try write:
        { MODKEY, XK_F2, spawn, "exec $(cd ~/doc && urxvtc)
but seems not work.
Any advises? Thank you, maybe you can understand me, my English is very
poor as you see ^_^

Cheers,
Received on Thu May 17 2007 - 12:27:57 UTC