215253 Form Validation Script

I need a script to filter spam on my online form. The forms can be found here (http://cornholestore(dot)com/[login to view URL] and http://cornholestore(dot)com/[login to view URL] I am getting a lot of spam and I need a security phrase that people will have to type in...if it is correct the form is sent. Here is an example ([login to view URL];CODE=10) Please pm me with any questions.