I have just posted instructions for creating a digital picture frame on my blog.
http://raspberrypihobbyist.blogspot.com ... frame.html
But to answer your immediate question - samba is the package that you need. It provides support for MS Windows networking.
It is typically used to share folders on a Linux system but is also capable of mounting network shares so that they appear as if they are local.
sudo apt-get install samba
sudo mkdir /mnt/SOMETHING
sudo smbmount //PCNAME/SHAREDFOLDERNAME /mnt/SOMETHING -o user=YOURUSERNAME
Obviously, you need to replace the items in uppercase with the appropriate info for your setup.
Sometimes you have to specify the IP address instead of PCNAME.
Sometimes you have to specify PCNAME/YOURUSERNAME instead of just USERNAME
You will be prompted for a password.
You can add -o password=YOURPASSWORD to the command line to prevent this.
You can add this command to the end of /etc//rc.local so that it is executed on boot.
Or, an appropriately formatted line can be added to /etc/fstab
- Ted B. Hale