i have problem in the upload image

[mary]

i am trying to make my image dynamic and this is waht i am doing
exactly
i write in my model     full_image = meta.ImageField(upload_to =
os.path.join(os.environ['Grill23_HOME'], '/media/images'), null = True,
blank = True)
and i found that Django creat a new folder /media/images/ and put the
pictures in it but what i need is to put the picture in mapth relative
to the MEDIA_ROOT
can anyone help me pls