function gotourl(url){
	document.location.href = url;
}
function showimg(img, img_width, img_height){
	window.open(img, 'Afbeelding', 'width='+img_width+',height='+img_height+',directories=no,menubar=no,status=no,resizable=no,scrollbars=no,toolbar=no,location=no');
}
function showwindow(win, win_width, win_height){
	window.open(win, 'Window', 'width='+win_width+',height='+win_height+',directories=no,menubar=no,status=no,resizable=no,scrollbars=yes,toolbar=no,location=no');
}