function csspopup() {
// PopUp verstecken
document.getElementById("popup").style.display = "none";
// Cookie setzen
var expirationdate = new Date();
expirationdate = new Date(expirationdate.getTime() + 1000*60*60*24*45);
document.cookie = "PopUp=nomore;expires=" + expirationdate.toGMTString() + ";";
}

function cookiecheck() {
// Prüfen ob Cookie vorhanden
if (document.cookie.search("PopUp=nomore") == -1)
{
// Nicht vorhanden, also PopUp anzeigen
document.getElementById("popup").style.display = "block";
}
}

if(bodyload) {
	var start = new Date('2012-01-16');
	var end   = new Date('2012-02-26');
	var now   = new Date();
	if( start <= now && now <= end) {
		bodyload.add(cookiecheck,'');		
		
		var addNavItem = function() {
			var trg = document.getElementById('iwwb-link');
			if(trg) {
				var dt = document.createElement('dt');
				dt.innerHTML = 'Nutzerumfrage 2012';
				var dd = document.createElement('dd');
				dd.style.textAlign = 'center';
				dd.style.padding   = '1em';
				dd.innerHTML = '<a href="http://iwwb.zensus.eu/_umfragestart.php?p=258" target="_blank"><img src="http://iwwb.zensus.eu/images/IWWB-Umfrage.gif" alt="Hier gehts zur Umfrage..." border="0" align="absmiddle" /></a>';
			
				trg.parentNode.insertBefore(dt,trg);
				trg.parentNode.insertBefore(dd,trg);
			}
		};
		bodyload.add(addNavItem,'');
	}
}