automatic login to another web site from code?

I have a web page, there is a link to outside web page which needs login
(username and password to get in).  I have the username and password already, I
want the user/visitor to my page, click the link on my page, then automatically
redirect to the other web page bypass the login. How to do that?

It should work like, in my code, I need to get the outside login page first,
then coding to fill the username input textbox with a valiad username, fill the
password with a valid password, then envoke the login button on the outside web
login page, then my page rediect to the outside web page passed login.

 Are there any sample codes for that? Thanks

Hi,

you just make a function with nessarry parameters. and then you can call the
function with nessaary values.

I thing that you are palce the coding in a button's click event

Thanks Thirumaran, could you provide some sample code here? I don't know where
to start? and what functions need to be used?