I fixed the problems I got.
I 've got 2 questions about using the Captcha field:
First, The captcha text is written in yellow with a white background, I looked at the form design but could not find it..
Second, It seems that whatever I write in the Captcha filed, the form is sent... how can we do first a check on the text written in this field before sending the form..
Thank you for your help.
regards, Mr Simon