newwindow=false;
	function profil(url,breite,hoehe) {
  	if(newwindow&&newwindow.closed==false)
    	newwindow.close()
    	var l = (screen.availWidth - breite) / 2;
    	var t = (screen.availHeight - hoehe) / 2;
    	newwindow = window.open(url,"newwindow","width=" + breite +
                                            ",height=" + hoehe +
                                            ",left=" + l +
                                            ",top=" + t + ";");
  newwindow.focus();
}