function popup(url) {
	
	var w = window.open(url, 'Wijzigen', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=no,width=400,height=250');
	w.focus();
} // end function popup(url);

function CloseWindow() {
	
	alert(this);
	alert(this.window);
	this.window.close();
} // end function CloseWindow()