on the index page, you need to following code to attach the security assist helper file:
<?php require_once( "WA_SecurityAssist/Helper_PHP.php" ); ?>
on the login page, make sure the forms action is set to post querystring variables that are passed in:
action="<?php echo $_SERVER["PHP_SELF"]; ?><?php echo (isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] != "")?"?".$_SERVER["QUERY_STRING"]:""; ?>"