Problem with new member submission

I have installed dolphin on my website - www.lifpro.com - and I am experiencing the following problems:

- Registering site members works fine under FireFox browser, however under Internet Explorer it is not accepting the Captcha codes and thus not allowing users to register. Is there a known fix to this bug?

- The submit button of the Add Feedback form does not work, under no browser.

Anyone who has information/fixes/suggestions on the above problems kindly contact me.

Regards,

Johnaton

I have de same problem witj the Captcha

I "solve" the problem... 

I had my page with an domain frame redirected. Under this domain captcha code was not accepted in the new users registration form.

I chage to http redirectión, so now in the adress URL bar it show the direct adress but not the domai adress i like to use. 

Some one know any solutión more elegant?

Ragards