I have set up a form with a textarea to accept the comment from user.
I have a function to validate the bad characters to the textarea and it seems to me that it doesn't accept the carriage return. When I hit the enter key and click submit, my error trap returned that was the bad character.
How I can work around this problem please? Thanks for all helps.

change your validation so that it does accept the carriage return! If you show us the code we may be able to help...