Thank so much for all response. It's helps a lot. Shazana Hilda Shamsuddin MSc.of Molecular Pathology, Dept. of Pathology, School of Medical Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia. Off. no: +609- 766 4440 Fax no: +609- 765 3370 Email: hilda_1075 <@t> yahoo.com