Thanks Gail for the valuable comments. I should study more about indexes.

Dear Jeff,

Thanks for the explanation, I learnt a lot. I can't say how much thankful I am. I hope I can compensate it some time.

Yours sincerely,

Parham

Dear Joe,

U made me think. thanks for your effort, anyway. I think there are enough job openings, don't worry. You won't be jobless. ;-):-D

Jeff,

I am completely conviced. Your explanation was so thourough and precise. I was wrong. Actualy, it was not my fault, I was kinda misled, since I have seen many...

Dude, have u understood what I was looking for? I guess you didn't get my question, read more!!:hehe: