I have started writing Fox_captcha class in 2008 because I needed to offer quick and simple way to get your own CAPTCHA system that supports the feature to reload a new validation code.
After getting advices from valuable users and developers such as you, I solved a problem related with reloading the image in Internet Explorer reload, as you may read in the Fox_captcha support forum.
And again I noticed a problem that comes with the load wait for animated GIF when you use a slow Internet connection which prevents temporarily the animated image to be displayed. Also this problem is solved.
Now, by doing a simple search on Google Image for "Fox Captcha" you will find that many Web sites and applications use Fox_Captcha.
Therefore I would like to encourage you to use this class and kindly rate it and tell me what you like or dislike about the class.
If you are CakePHP fan, you will find a tutorial that I wrote describes how to use Fox Captcha inside your CakePHP app.
Your response will encourage me to support this class further and so your feedback will be appreciated.