Hi Prathap,
You dont't need to say sorry =)).
1) When you assign points to the replies, it makes more easy for the forum members to see which reply helps you and which is not. You can even assign N/A for some reply, if it didn't help you. Read the point assigning system, when you post a new question.
2) This ultimately will help you in solving your problem.
3) All the forum members are here only for helping others ( ofcourse learning too ) and when you assign points to each reply, that's like saying THANKS to them.
4) Assigning points is optional, it all depends on your wish !
5) Another important thing is when your problem get resolved, please summarize the solution which worked for you, because it will help all of us for future refernce.
HTH,
Shiju
Life is a promise, fulfill it!