function verpflichtungPopup() {
	currentTime = new Date();
	// Attention: month and year start with 0 '(so e.g. February is 1)
	beginTime = new Date(2007,1,1);
	endTime = new Date(2007,1,11);
	// calculate the size of the popup window (1/4 from the original window)
	siteHeight = screen.availHeight;
	siteWidth = screen.availWidth;
	popupHeight = Math.round(siteHeight * 0.5);
	popupWidth = Math.round(siteWidth * 0.5);

	if ((currentTime >= beginTime) && (currentTime <= endTime) && (document.URL == 'http://www.szabo-scandic.com/')) {
		Fenster = window.open("verpflichtung.html" , "Verpflichtungserklärung" , "dependent=yes,height="+popupHeight+",width="+popupWidth);
		Fenster.focus();
	}
}