if (parent.location.href == self.location.href)
    window.location.href = 'http://www.traptrein.nl';

function popUp1() {
 	myPic = open("cateringlijst.html", "displayWindow", "width=750,height=500,status=no,toolbar=no,menubar=no,scrollbars=yes,resizable=no");
   			}