function fenster(a) {
  var x=((screen.width -700) / 2);
		var y=((screen.height -460) / 2);
		
		window.open(a,'Grossansichten','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=700,height=460,left='+ x + ',top=' +y);
		window.focus;
}
function quer(a) {
  var x=((screen.width -820) / 2);
		var y=((screen.height -700) / 2);
		
		window.open(a,'Grossansicht','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=820,height=700,left='+ x + ',top=' +y);
		window.focus;
}
function hoch(a) {
  var x=((screen.width -470) / 2);
		var y=((screen.height -700) / 2);
		
		window.open(a,'Grossansicht','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=470,height=700,left='+ x + ',top=' +y);
		window.focus;
}
function anfragefenster(a) {
  var x=((screen.width -800) / 2);
		var y=((screen.height -500) / 2);
		
		window.open(a,'Formular','toolbar=yes,location=no,directories=no,status=no,menubar=yes,scrollbars=yes,resizable=yes,width=800,height=500,left='+ x + ',top=' +y);
		window.focus;
}