function popup() {
	window.open('../invoer/speciaal/index.php', 'animatie', 'width=800, height=600, toolbar=0, scrollbars=0, location=0, status=0, menubar=0, resizable=0, screenX=' + ((screen.width - 550) / 2) + ', screenY=' + ((screen.height - 400) / 2) + ', top=' + ((screen.height - 400) / 2) + ', left=' + ((screen.width - 550) / 2) + '')
}