Get rid of "Do you want to close this window?"

You might get a question when opening CRM in Internet Explorer. The question is:The webpage you are viewing is trying to close the window.Do you want to close this window?yes noThis message does appear in CRM 4.0 only when you are using Internet Explorer 7.0 and you have enabled the application mode setting. Nevertheless, it is an anoying message which you can get away!To get rid of this message