<form action="
https://myserver.com/HomePage.do" method="post">
<p>
Usernane:
<input type=text name="username" >
Password:
<input type=password name="password" >
<input type=hidden value="mydomain" name="DOMAIN_NAME" >
<p align="right">
<input type=submit value="Login" >
</p>
</form>