I have a form that allows a visitor to the site to send an email to a friend. I don't want spammers to find the form and use it to send unsolicited email. Is there a function in php or does anyone have some code that will allow me to produce a binary image with a random set of characters and then use a text box to where the user can enter the characters into the text box. If the characters they entered into the text box match what is on the image then the email sends, if not the email wotn send.
Greg
