function popupbanner()
{
	var popup = $('popup');
	if (!popup) return;

	if (get_cookie('popup')) return;

	name = 'popup';
	value = '1';
	date = new Date();
	date.setTime(date.getTime()+(24*60*60*1000));
	expires = "; expires="+date.toGMTString();
	document.cookie = name+"="+ value + expires + "; path=/";

	var grey = Construct.node('div', {id:'greybox',className:'banner_ad'});
	grey.onclick = function() { grey.style.display = 'none'; popup.style.display = 'none'; return false };
	popup.parentNode.insertBefore(grey, popup);

	var link = Construct.node('a', {href:''}, 'Sluiten');
	link.onclick = function() { grey.style.display = 'none'; popup.style.display = 'none'; return false };
	var p = Construct.node('p');
	p.appendChild(link);
	popup.insertBefore(p, popup.firstChild);

	popup.style.display = 'block';
	popup.style.marginLeft = '-' + (popup.offsetWidth / 2) + 'px';
	popup.style.marginTop = '-' + (popup.offsetHeight / 2) + 'px';

}

addEvent(window, "load", popupbanner);