def _check_css(cssname):
"""
If C{cssname} is not valid, then issue an error and exit.
"""
if cssname is None: return
if os.path.isfile(cssname): return
from epydoc.css import STYLESHEETS
if STYLESHEETS.has_key(cssname): return
# We couldn't find it.
print >>sys.stderr, '\nError: CSS file %s not found\n' % cssname
sys.exit(1)
