Need to access the secure page of another site

[naju]

There is a another-site such as :
http://his-site.com

there is a form on
http://his-site.com/submit_something.do

To access this page we need to go through login from
http://his-site.com/login.do

Now i have my site - http://my-site.com/
i do have the login information for his-site
i need to auto-login and access the form page of his-site from my-site
like http://my-site.com/submit_to_his-site.do

How do i create the authentication to his-site without logging to his page.
all the things should be hidden inside my-site.

its Like -
The user will come to my-site and login.
He will use my-form to submit to his-site.com's form

Now I can do everything except the POST operation for the login to his-site.com

IFRAME and Ajax can solve my problem in a way
but i need some more robust work flow.
coz i'll be using this on cron job.

[naju]

ok here is some more in detail

his-site.com has database
and also the form to insert data to his-database

my-site.com will also have the HTML form.
but the post from the my-site will go to his-site.

All this things should happen inside the server
the user should not get clue about his-site.com

[Vai]

I think that you would need access to his site to place code on the page you want secured.

[naju]

look its like ...

i will make a chat-room based on the this forum we are using

but the user will have have to type the http://www.daniweb.com/ on URL

but we know ... to reply or to post in this forum we need to login to this site. isn't so???

now i need to submit to some post from my-site ... with logging from my-site ...

how??

[naju]

OK suppose

you save your hi5 login account to my-site.
when you change the profile Status (Scrapbook) of my-site then it must automatically change on your profile of hi5

[naju]

:D
its all me in this post
:D

curl does these all for you
for more info:
http://php.net/curl

Thanks all