desu.py

from BeautifulSoup import BeautifulSoup
import urllib
import sys, os

html = urllib.urlopen(sys.argv[1])
soup = BeautifulSoup(html)
images = soup.findAll('a')

try:
    dir = sys.argv[2]
    if not os.path.exists(dir): os.mkdir(dir)
    if dir[-1] != '/': dir += '/'
except:
    dir = ''

for a in soup.findAll('a'):
    try: # Try & except are there because sometimes the script throws an error and exits
        if '.jpg' in a['href'] or '.png' in a['href'] or '.gif' in a['href']:
            image_name = a['href'].split('/')[-1]
            if os.path.isfile(dir+image_name):
                continue
            else:
                print image_name
                urllib.urlretrieve(a['href'],dir+image_name)
    except:
        continue