got another validation error question

[eluser]R_Nelson[/eluser]
is there a way to create my own validations like for captcha it's either true or false but i would like to put in a custom error in for it! but i don't even see an validation for true or false i can do it manually with an if statement but i'm trying to keep my lines of code down!

[eluser]InsiteFX[/eluser]
You would need to extend the Form_Validation class.

InsiteFX

[eluser]Nur Cholikul Anwar[/eluser]
create callback function to your controller. tks