but assuming you mean 'panes', it seems you can:
Ctrl-b o
to move around the current window's panes clockwise. Although I prefer inputing a given direction like the other replier suggested with arrow keys.
For me moving between windows and panes is something that I do a lot. So much so that I removed the need to use the 'tmux prefix' to do so. In my ~/.tmux.conf I have for window and pane switching:
# set pane switching with <alt>{U, E, N, I} for up, down, left, right and respectively without needing prefix
bind -n M-N select-pane -L
bind -n M-I select-pane -R
bind -n M-U select-pane -U
bind -n M-E select-pane -D
# set window switching without needing prefix
bind -n M-a select-window -t :1
bind -n M-r select-window -t :2
bind -n M-s select-window -t :3
bind -n M-t select-window -t :4
bind -n M-d select-window -t :5
bind -n M-h select-window -t :6
You can just replace the keybindings I chose like M-a (alt-a) to something that works for you. If you want to keep using a prefix (incase you are worried the keybindings will clash with other program/system bindings), remove the '-n' flag. Hope that helps.
If it doesn't here is a tutorial I found from a google search: http://blog.hawkhost.com/2010/06/28/tmux-the-terminal-multip...
and IMO a really good book on Tmux if you decide to dive in more: http://www.amazon.com/tmux-Productive-Mouse-Free-Development...
http://www.amazon.com/tmux-Productive-Mouse-Free-Development...