Login Probelm in JQuery Colorbox Plugin

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ASP.NET

jQuery

Hi
I used Jquery Colorbox lightbox plugin in order to let users to login to my site ,this plugin use signin.aspx page in order to evaluate the user's credentials, but the problem is when someone try to signin ,I'm facing this error:
Blocked a frame with origin "http://www.example.com" from accessing a frame with origin "https://www.example.com".
The frame requesting access has a protocol of "http",
the frame being accessed has a protocol of "https". Protocols must match.

Any idea ,I would really appreciate