Institution: | [1]Muhammad Aamir is with the Department of TechnologySupport, National Bank, Karachi, Pakistan. This work wasstarted when he was pursuing MS degree in informationtechnology from SZABIST, Karachi, Pakistan. E-mail:muhammad.aamir @ nbp.com.pk; aamir.nbpit @ yahoo.com. [2]Mustafa A. Zaidi is with the Department ofComputing, SZABIST, Karachi, Pakistan. |