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It might not be related to your post which is great BTW. My ajax call gave me error. Location at http://.../system/ajax and error message is "Notice: Undefined index: form_build_id at ajax_get_form() (line 320 at /opt/www/nobo_iguide/includes/ajax.inc)." I guess it's related to other modules or settings that I used or applied. Just want to ask you in case you know.