Javascript Permission Denied in Internet Explorer IE

Anyone can elaborate on what to do about a Permission Denied JS error when using IE 7 with JS error display turned on. It is occurring in core.js, line 1010:

var notification = parent.window != window ? $(‘.cm-notification-container’, parent.document) : $(‘.cm-notification-container’);

My IE 7 security setting is set to the default medium-high. I didn’t notice the error until I turned on the option to display all JS errors.

Wondering what this controls, what will be the end result of the error, and if it should be fixed and if so, how?