[css] - <img src="..."

#!/usr/bin/env python

import os, re, urllib
from urllib2 import Request, urlopen, URLError, HTTPError

def main():
    base_url = "http://www.google.com/events/io/2011/static/css/"
    source = "style.css"
    file = open(source)

    # download images referenced in stylesheet
    for line in file:
        urls = re.findall("url\((.*)\)", line)
        if (urls and len(urls) > 0):
            fullpath = base_url + urls[0]
            filename = os.path.basename(fullpath)
            if not os.path.isfile(filename):
                stealStuff(urls[0], "", base_url)
            else:
                print "Skipping %s" % filename

    # remove relative pathnames in stylesheet
    input = open(source, 'r')
    output = open(source + ".tmp", 'w')
    for s in input:
        urls = re.findall("url\((.*)\)", s)
        if (urls and len(urls) > 0):
            img = os.path.basename(urls[0])
            output.write(re.sub("url\((.*)\)", "url(" + img + ")", s))
        else:
            output.write(s) # otherwise leave line unchanged

    # replace original file with new stylesheet
    #os.rename(source + ".tmp", source)

def stealStuff(file_name, file_mode, base_url):
    #create the url and the request
    url = base_url + file_name
    # remove all occurrences of the '/../' pattern
    url = re.sub(r'(.*)/(.*)/[.]{2}/(.*)/(.*)', r'\1/\3/\4', url)#.replace("//","/")
    req = Request(url)

    # Open the url
    try:
        f = urlopen(req)
        print "downloading " + url

        # Open our local file for writing
        local_file = open(os.path.basename(file_name), "w" + file_mode)
        #Write to our local file
        local_file.write(f.read())
        local_file.close()

    #handle errors
    except HTTPError, e:
        print "HTTP Error:", e.code , url
        sys.exit(0)
    except URLError, e:
        print "URL Error:", e.reason , url
        sys.exit(0)

if __name__ == "__main__": main()