GNU screen directory of new shell

Hi,

I have been using screen for a couple of months now and I love it - it
makes moving from home to work a piece of cake since I can just
reattach all my current terminals and get right back to work! I have
pretty much got it set up as I would like it now - that includes
finding a suitable escape key that doesn't ruin my emacs world ;P

One thing that I would like to do, which I have not been able to
figure out, is when I open a new shell have it move to the directory
of the shell it is opened from. So, I start screen and get the prompt
at ~/, if I move to ~/Music, then open a new shell it opens to ~/Music
and not ~/. Similar to the chdir command, but not always the same
folder.

I hope this make sense, thanks

David