on each of the forms, make sure the action of the form includes the querystring variables.
for example:
instead of:
php:
<form class="NewFromBlank_Default" id="SimpleContact_NewFromBlank_Default" name="SimpleContact_NewFromBlank_Default" method="post" action="<?php echo $_SERVER["PHP_SELF"]; ?>">
use:
php:
<form class="NewFromBlank_Default" id="SimpleContact_NewFromBlank_Default" name="SimpleContact_NewFromBlank_Default" method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?><?php echo (isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] != "")?"?".htmlspecialchars($_SERVER["QUERY_STRING"]):""; ?>">
