Faisal Taleb Talab Khamayseh Faculty of Computers and Information, Helwan University, Cairo, Egypt faisal_tkh@yahoo.com | Ahmed Sharaf Eldin Ahmed Faculty of Computers and Information, Helwan University, Cairo, Egypt profase2000@yahoo.com | Laila Mohamed El-Fangary Faculty of Computers and Information, Helwan University, Cairo, Egypt lailaelfangary@hotmail.com |