Downloading/Saving to a Directory

[TheRandomPast .]

Hi,

I've created a script that allows me to see how many images are on a
webpage and their URL however now I want to download all .jpg images from
this website and save them onto my computer. I've never done this before
and I've become a little confused as to where I should go next. Can some
kind person take a look at my code and tell me if I'm completely in the
wrong direction?

Just to clarify what I want to do is download all .jpg images on
dogpicturesite.com and save them to a directory on my computer.

Sorry if this is a really stupid question.

import traceback
import sys
from urllib import urlretrieve

try:

        print ' imagefiles()'
        images = re.findall(r'([-\w]+\.(?:jpg))', webpage)
        urlretrieve('http://dogpicturesite.com/', 'C:/images)
        print "Downloading Images....."
        time.sleep(5)
        print "Images Downloaded."
except:
        print "Failed to Download Images"
        raw_input('Press Enter to exit...')
        sys.exit()

def main():
    sys.argv.append('http://dogpicturesite.com/')
    if len(sys.argv) != 2:
        print '[-] Image Files'
        return
    page = webpage.webpage(sys.argv[1])
    imagefiles(webpage)
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