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Singning into a website programmatically through a web application JAVA/Javascript/JSP

I need to write a web application that will  ask user to specify a website and then provide a user name and password to login to that  site and open the  website page as that user logged in.
I am looking fwd to see comments in terms of JAVA/JSP/ and prefferrably Javascript
 For authentication  to the guest site (Where user will login through script or program)I am assuming no encryption for   now simplt GET and POST will work.
1 Solution
I've used "twill" (python) for programmatically logging into web sites.  Below is a sample script that includes install instructions.

# 1) Install Python (I used 2.4.3) http://www.python.org  You will also want to modify your Windows "PATH" environment (C:\Python24\;) variable to allow you to say "python" from any directory.
# 2) Download and run the easy_install module http://peak.telecommunity.com/dist/ez_setup.py in python.  Again you will want to add to your "PATH" (C:\Python24\Scripts;)
# 3) Insall "twill" by saying: easy_install http://darcs.idyll.org/~t/projects/twill-0.8.5.tar.gz
# 4) Say: twill_sh <the twill script you want to run>
# Command List: http://darcs.idyll.org/~t/projects/twill/doc/commands.html

#setlocal username <username goes here>
#setlocal password <password goes here>

setlocal username JoeUser
setlocal password JoesPassword

# If you want to watch HTTP headers (like response codes) set this to "1"
debug http 0

config use_tidy 0
config use_BeautifulSoup 0
config allow_parse_errors 0

#Impersonate Firefox
#agent "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20060909 Firefox/"

#Impersonate IE6
agent "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)"

go http://somewebsiterequiringlogin

formvalue 1 userid $username
formvalue 1 pwd $password

# Now you can navigate within the site

go http://someotherarea1

go http://someotherarea2

mostenscerAuthor Commented:
well I have developed the application that will open the website in an iframe. what I need to do is have it  fill the login form automatically with the info I provide
I am using java and velocity for server side and on client side i have html/javascript
for instance site is www.example.com/login.cfm 
how would I ensure that once I link to that website the username and password goes in automatically.

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