iFrame with PHP reCaptcha page enbedded

I have a Microsoft Expression web site to which I would like to add a reCaptcha page.

I have installed PHP and gotten reCaptcha working when navigating to the .php page with my browser.

The problem however, arises when I try to display the parent page with the .php inside of an iframe.

I am only getting the Submit Query button and not the r开发者_StackOverflow社区eCaptcha image.

Is there some sort of <!DOCTYPE> setting or include that needs to be added to my non-PHP page to allow it to show correctly?