Without seeing the entire script, would this change help?
Change:
PHP Code:
session_start();
if (!isset($HTTP_SESSION_VARS['first_name']) || $HTTP_SESSION_VARS['first_name'] != "first_name") {
header ("Location: /members/login_form.html");
}
To:
PHP Code:
session_start();
if (!isset($HTTP_SESSION_VARS['first_name']) || $HTTP_SESSION_VARS['first_name'] != $first_name) {
header ("Location: /members/login_form.html");
}
Just a shot in the dark.