Can't Register over HTTPS

[epixoip]

radix, the captcha on the registration page is hard-coded to load over http.

Code:

<iframe src="http://www.google.com/recaptcha/api/noscript?k=6LcF6LsSAAAAABUq1MwV0V7SOqarspAx03O1sopC" height="300" width="500" frameborder="0"></iframe>

this causes it not to be displayed when loading over https.