Look at the example I gave (the link).
You need to get something like (watch the bolded stuff):
fireSQLquery("SELECT Destination_ID, Destination_Name FROM destinations;");
while (there are rows)
// get one row as $Dest_ID, $Dest_name
echo "<option value='$Dest_ID'>$Dest_name</option>"
$selected_dest_id = $_POST["destination"];
// do something with $selected_dest_id