How to add "are you sure you want to close this window in sharepoint by using infopath designer"?

Hi Everyone,

I implemeted a leave request by using sharepoint designer , for a form apperance purpose edited that list in InfoPath designer. Now i want to add action to this list. That is how can i addare you sure you want to close this window after clicking on submit button.

Please help me out here.

Thanks and Regards,

Santhoshi.