Captcha is a system for generating a random image containing characters to ensure that a form can only be submitted by humans, not malicious scripted 'bots' that can bring down websites by automatically spamming forms.
There is a known bug with captcha in Firefox 3 that prevents the image from displaying.
Until there is a workaround, you could try using an alternative browser such as Opera or Chrome.
Or you could just send me an email with the details.
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