In line 26, you are changing your current working directory to the root directory which seems to be "P:\Projects_2013\"
You need to change line to 26 to this:
os.chdir(os.path.join(path, asset_name))
Also, note that your code will fail if P:\Projects_2013\ doesn't exist. Are you sure it'll exist for everyone? Are you also sure everyone is mapping this drive where Projects_2013 exists to P? If not, you might want to use UNC instead
Hope this helps!