how to get my own class as library

[eluser]saidbakr[/eluser]
Hello all,

I have a class published on www.phpclasses.org and its called Fox_captcha. It is meant by creating captcha verification images.

Its package includes two files, Fox_captcha.php - the class file - and another file called fox_captcha_image.php which generates image for reload the image.

My question how could I able to set it as a library working with CI?

Do you think using it as a helper will be better and how?

I think dealing it as an helper will require a third file inwhich I have to write a function that will able to initiate the object and its methods.