Captcha Script

Hi, I need to add a captcha script to two forms on my website (Registration and contact us). This two forms are templates and they are .html You will need to add the script to the forms, install it and test it. The captcha script will need to have at least five characters. Will need to have the option of refreshing the image. The script will need to give a warning after you submit the form if you put the wrong verification image. Half payment to go to GAF escrow account once you been chosen for the project. Other half to be paid once project has been completed.