php javascript help code

MORE JAVASCRIPT CODE and php code in the below site url...

http://www.dynamicdrive.com

CAPTCHA CODE EXAMPLE SITE:--

http://www.bitrepository.com/a-basic-captcha-with-refresh-feature.html

http://www.bigresource.com/PHP-Captcha-refresh-BCNVHYwF.html

http://www.planetsourcecode.com/vb/scripts/ShowCode.asp?txtCodeId=2522&lngWId=8