Automatic "j_security_check" form login submission question

I've been using J2EE 1.4 declarative security with no problems.
It works great. I define the security constraints to the server and
when the relevant pages are hit the login.jsp page gets invoked
where users can login. I happen to be using Tomcat 5 right now, but again it all works fine.
But now I have to receive http User Login requests from a non-java server and automatically log the user in if they were logged in on the prior server since I support the same User-Ids/Passwords.
My question is simple and may only be an HTML trick. On the login page code specifically for users where I already have their User-Id and Password how do I auto-submit the form without requiring user's to press the "submit" button? For this type of user where I know the UserID and Password I will not have any displayed HTML since the user does not have to do anything. For traditional manual login, I always used the following format with the submit button, but again, now I want to bypass the JSP/JSTL/HTML display and submit automatically (using code) instead of requiring the user to press the submit button.
<form method="POST" action="j_security_check" >
<input type="text" name="j_username" size="8" maxlength="8" />
<input type="password" name="j_password" value="FMTPPSWD" size="8" maxlength="8" />
<input type="submit" value=" Login " />
</form>
Help!
I've already orchestrated the solution in my login.jsp configuration to separate between the JSP Display page supporting manual login (using jsp:forward) and non-display auto-login. So my question is only how do I submit a form programatically without using the submit button?
Thanks.

For the benefit of others here is the JSP/JSTL & javascript solution.
This allowed me to create an automated login and use declarative security ...
The following code requires param.UserID and param.PassWord to be set before it is executed...
<form name="AutoLogin" method="POST" action="j_security_check" >
<input type="hidden" name="j_username" value="<%= request.getParameter("UserID") %>" size="8" maxlength="8" />
<input type="hidden" name="j_password" value="<%= request.getParameter("PassWord") %>" size="8" maxlength="8" />
</form>
<script type="text/javascript" language="JavaScript">
document.AutoLogin.submit();
</script>

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