http://www.bettersolutions.com/excel.aspx
http://www.contextures.com/tiptech.html

try it
hth
regards from Brazil
Marcelo

"aarif" escreveu:

> Dear all,
>
> I am an average user, facing problems in using formulas becouse i do not
> know that how which formula should be used for such function and how to use ?
> Is there any way I can get formulas and how use it ?
>
> Thanks in advance,
>
> Aarif