Secure content issue in IE with iframe twitter button

[Mazter81]

Hi

I’ve created a twitter button for my website using iframe. The iframe is like this:

When the site is loaded in IE9 I get a message stating: “Only secure content is displayed” prompting the viewer to click “show all content” before the button is displayed.

Am I doing something wrong or is this a IE-related issue

Thanks in advance

/Morten

[niall]