You might try:
<?php
if (isset($_SESSION["WASearch_Recordset2"])) {
?>
// show this when a filter is applied
<?php
}
?>
or
<?php
if (isset($_POST["WADbSearch1"]) || isset($_POST["WADbSearch1_x"])) {
?>
// show this when a filter is applied
<?php
}
?>
The problem with the second one is that it wouldn't show after navigating to the next page of results.