@KRyan Thanks very much for your nice answer. Its really helpful to me.

@RogerMungo I am glad! that is why we were here. And, in fairness to everyone voting to put the question on hold, they were also trying to help you—usually, narrower questions get better answers faster around here, so putting a question on hold to narrow it down often helps the asker. They were misguided in this case, but the instinct is usually pretty sound.