i copied the templates and media folders from the installation folder of django (django/contrib/admin) to my projects folder(f:/django/mysite) and changed my settings.py file to:

TEMPLATE_DIRS = (
    "f:/django/mysite/template", 
)

now i can change the the base.html and etc. but changing the CSS files in the media directory won't effect my project.

so the question is how can i tell django to read the CSS located in the media directory and how can i change the values of the variables in files like base.html (Where are they getting their values?)