function popupOpenen(url,naam,breedte,hoogte,scrollbars) {
	var xPos = (screen.availWidth - breedte) / 2
	var yPos = (screen.availHeight - hoogte ) / 2
	service = window.open(url,naam,"menubar=no,toolbar=no,resizeable=no,scrollbars="+scrollbars+",width="+breedte+",height="+hoogte+",screenX="+xPos+",screenY="+yPos+",left="+xPos+",top="+yPos+",screenX="+xPos+",screenY="+yPos+",left="+xPos+",top="+yPos);
	service.focus();
}