Hi Dani, thank you for your help... I did what you told me but there is still a problem...
First, when you test the page in Fireworks, it displays the server validation messages even that you have not pressed the submit button... (see fig. web1)
Then, when you fill in the fields... in the original field ones the server validation message goes but in the new ones (the fields I add to the form) the message don´t go (see fig. web2)
Can you help me with this strange behaviour ??