pass data to new window using hyperlink

[takalak]

Hi, is there a way to pass data to a new window without showing the data on a hyperlink?
especially if passing login and password to a new site, I want to hide the parameters. is there any other way of doing this?

example:
$userid="userid";
$password="pasword";
<a href='www.newsite.com/login.php' target='_blank'><Link to new site</a>

or I can only use this method to pass the data?

<a href='www.newsite.com/login.php?userid=".$userid."&password=".$pass." ' target='_blank'><Link to new site</a>

in Login.php, get the userid and password and login.

thanks

[TheDefender]

To "hide" the data, about the only thing you can do is encrypt it. Otherwise, you'd need to use a form, and pass them from hidden fields using a POST method.