Thanks for your advice corion but somtime I found the documention not enought clear and even the book. They are not enought straight forward even on of my tutor, he complain there is not enough example to tell you what the code means or what the code do.
I have read a book of Perl "Perl and CGI for the World Wide Web" and it is quite straight forward what you need to do. What this book says, it is better to give example to the novice instead to a long documentation to read. I don't blame you "corion" because you are right and I respect all the people from this useful forum. For me, it is a great forum to have discussion and to have help from wise people.

Maxim