Connect to an external page widget is connected

I'm trying to find debugging custom applications in IE7 it by clicking the button runs similar to pop

Http://www.facebook.com/connect/connect_to_external_page_widget_loggedin.php?social_plugin=like&external_page_url=https%3A%2F%2Fwww.facebook.com%2Fbmobile#_

I haven't seen this happen on every browser version or for that matter ...

What causes this to happen?

What causes pop not close, and click "like" not to record?