function popup_gallery(data) {
  window.open(sitebase + 'gallery/' + data, 'proculture_gallery', 'left=0,top=0,channelmode=no,directories=no,fullscreen=no,location=no,menubar=no,resizable=no,scrollbars=no,status=no,toolbar=no');
}


function maillistclick() {
	var textbox = document.getElementById('maillistemail');
	if (textbox.value == 'type hier uw email adres') {
		textbox.value = '';
	}
}

var imgwhonormal = sitebase + 'images/layout/button-wie.jpg';
var imgwhoover = sitebase + 'images/layout/button-wie-over.jpg';
var imgwhodown = sitebase + 'images/layout/button-wie-down.jpg';

imageprefetch(imgwhoover);
imageprefetch(imgwhodown);

var imgwhatnormal = sitebase + 'images/layout/button-wat.jpg';
var imgwhatover = sitebase + 'images/layout/button-wat-over.jpg';
var imgwhatdown = sitebase + 'images/layout/button-wat-down.jpg';

imageprefetch(imgwhatover);
imageprefetch(imgwhatdown);

var imghownormal = sitebase + 'images/layout/button-hoe.jpg';
var imghowover = sitebase + 'images/layout/button-hoe-over.jpg';
var imghowdown = sitebase + 'images/layout/button-hoe-down.jpg';

imageprefetch(imghowover);
imageprefetch(imghowdown);