Thanks you for your help Falko. You are dead right my domain registrant (tenthmatrix.net) didn't allow full DNS mgmt. or may be no same ip for both name servers. So I registered a new domain called dnsvalley.com which is working. If I can offer you anything please don't hesitate to contact me. You can use CMS system I have written for hosting & managing your site if you want: Try
http://demo.calibanweb.com