How do I redirect a secure zone login form with javascript?

Question

I would like to redirect what page a user goes to after filling out the secure log in form. I would change the landing page of the secure zone, but I need a log in form to go to a different page of the site. I would also create a seperate secure zone, but I have almost 3000 subscribers and it would be very time consuming to add all those users to this new zone.
I would like to redirect the user (using the form from a secure zone) to a different page other than the landing page of the log in form. How do I do this with javascript?
I saw this page: http://kb.worldsecuresystems.com/598/bc_598.html#main_Logging_into_different_Secure_Zones_ according_to_ID_number but couldn't make sense of it for my current situation. (I don't need multiple zones, just the form to redirect to a different page after submission)
<form action="https://redlakewalleye.worldsecuresystems.com/ZoneProcess.aspx?ZoneID=12369&Referrer={module_siteUrl,true,true}&amp;OID={module_oid}&amp;OTYPE={module_otype}" method="post" onSubmit="return checkWholeForm52938(this)" name="catseczoneform52938">
            <div class="form">
            <div class="item"><label for="SZUsername">Username</label><br />
            <input type="text" maxlength="255" id="SZUsername" name="Username" class="cat_textbox_small" /></div>
            <div class="item"><label for="SZPassword">Password</label><br />
            <input type="password" autocomplete="off" maxlength="255" id="SZPassword" name="Password" class="cat_textbox_small" /></div>
            <div class="item"><input type="checkbox" id="RememberMe" name="RememberMe" /><label for="RememberMe">Remember Me</label></div>
            <div class="item"><input type="submit" value="Log in" class="cat_button" /> <a href="/_System/SystemPages/PasswordRetrieveRequest">Lost password?</a></div>
            </div>
            <script type="text/javascript" src="/CatalystScripts/ValidationFunctions.js"></script>
            <script type="text/javascript">
                //<![CDATA[
                function checkWholeForm52938(theForm){
                    var why = "";
                        if (theForm.Username) why += isEmpty(theForm.Username.value, "Username");
                        if (theForm.Password) why += isEmpty(theForm.Password.value, "Password");
                        if (why != ""){alert(why);
                            return false;
                   // Add the redirect code here?
                    theForm.submit();
                    return false;
                //]]>
            </script>
        </form>

Answer 1

I've been working on the same thing and have nearly solved it with these tutorials:
http://www.bcgurus.com/tutorials/re-directing-users-to-the-correct-secure-zone
http://www.bcgurus.com/tutorials/building-a-better-secure-zone-login-page
The first tutorial will let a person continue on to the page he/she was attempting to access. For example, if your site offers learning lessons in a secure zone... A visitor could click on a lesson, get prompted to login and then be redirected to that particular lesson instead of the landing page for the secure zone.  The script in the tutorial also accommodates general logging in: "if the person wasn't going somewhere specific then send him/her here (landing page, user account, whatever).
Might be worth checking out the free BCGurus trial or joining for a month.
Brian