function win (url, width, height, winname) {
                var old = self;
                var trails="width=" + width + ",height=" + height + ",scrollbars=0,resizable=0,menubar=0,status=0,directories=0,toolbar=0";
                
                newWindow=window.open(url,winname,trails);
				var x = Math.round((screen.availWidth - width) / 2);
				var y = Math.round((screen.availHeight - height) / 2);
				newWindow.moveTo(x, y);
		} 
function winclose() {
		window.opener.focus();
		window.close();
}
function popdown() {
		window.opener.location.reload();
		window.opener.focus();
		window.close();
}
function popdownesc(url) {
		window.opener.location.href = url;
		window.opener.focus();
		window.close();
} 

function nonopop() {
		alert('Diese Funktion steht nur registrierten und angemeldeten Benutzern zur Verfügung!')
		window.opener.location.reload();
		window.opener.focus();
		window.close();
}
function nonopopA() {
		alert('Diese Funktion steht nur registrierten Autoren zur Verfügung!')
		window.opener.location.reload();
		window.opener.focus();
		window.close();
}