root/verdjnlib/context_processors/__init__.py

from django.conf import settings


def siteroot(request):

    context = {}

    try:
        context['site_url'] = settings.SITE_URL.strip()
    except AttributeError:
        try:
            from django.contrib.sites.models import Site
            context['site_url'] = Site.objects.get_current().domain
            if context['site_url'][-1] != '/':
                context['site_url'] += '/'
            if not context['site_url'].startswith('http://'):
                context['site_url'] = 'http://' + context['site_url']
        except ImportError:
            context['site_url'] = '/'

    try:
        context['media_url'] = settings.MEDIA_URL
    except AttributeError:
        context['media_url'] = ''

    return context