First, before the first select list, add the the following code to set the recordset to the first record:
<?php
$rows = mysql_num_rows($Recordset1);
if($rows > 0) {
mysql_data_seek($Recordset1, 0);
$row_Recordset1 = mysql_fetch_assoc($Recordset1);
}
?>
then select the first list, and add the Populate List from Array behaivor.
open the behaviors window:
Window -> Behaviors
NOTE: Behaviors, not Server Behaviors
click the plus button and go to WebAssist -> Dynamic Dropdowns -> Populate List from Array