implementing a captcha to an existing form.
I have created a website design site with a form to submit quotes that when submitted gets redirected to a thank you page to mail off the quote. now my problem is this form is submitted by spammers. i noticed with security assist we can add a captcha for a registration.php
now my question is, am i able to use a security assist to implement a captcha to an already built form to stop spammers?
what i need is, if they enter the captcha wrong it gives an error "please try again" on the form page. and once its been corrected it will be successfull and will submit to my thank you page.