Maybe it has something to do with this:
Try using this one:
Maybe your hosting provider is using a php version previous to
$ID= $_POST['ID']; $thePlotID= $_POST['thePlotID'];
$ID= $HTTP_POST_VARS['ID']; $thePlotID= $HTTP_POST_VARS['thePlotID'];
bye!Note: Introduced in 4.1.0. In earlier versions, use $HTTP_GET_VARS.