function displayWindow(theURL,winName,width,height,features) {

    var window_width = width;
    var window_height = height;
    var newfeatures= features;
    var window_top = (screen.height-window_height)/2;
    var window_left = (screen.width-window_width)/2;
    newWindow=window.open(''+ theURL + '',''+ winName + '','width=' + window_width + ',height=' + window_height + ',top=' + window_top + ',left=' + window_left + ',features=' + newfeatures + '');
    newWindow.focus();
}
function centeredWindow(breite,hoehe,seite,oben) {
	var breite = 750;
	var hoehe = 550;
	var seite = (screen.availWidth - breite) / 2;
	var oben = (screen.availHeight - hoehe) / 2;
	params = ('width='+ breite +',height='+ hoehe +',left='+ seite +',top='+ oben);
   window.open('http://www.neubritz.de/archiv/mappe/index.html','name',params);

}