var pop = null;

function popdown() {
  if (pop && !pop.closed) pop.close();
}

function popup(obj,w,h) {
  var url = (obj.getAttribute) ? obj.getAttribute('href') : obj.href;
  if (!url) return true;
  w = (w) ? w += 20 : 150;  // 150px*150px is the default size
  h = (h) ? h += 25 : 150;
  var args = 'width='+w+',height='+h+',resizable,scrollbars';
  popdown();
  pop = window.open(url,'',args);
  return (pop) ? false : true;
}

window.onunload = popdown;
window.onfocus = popdown;


function schliessen() {
	F = self.close();
}
	
function zurueck() {
	F = history.back();
}

function check() {
	if (document.getElementsByName("paket")[0].checked == true) {
		if (document.getElementsByName("paket_plus")[0].checked == true || document.getElementsByName("paket_plus2")[0].checked == true) {
			alert('Die Zusatzpakete PREMIUM PLUS und REDAKTIONSSYSTEM sind nur zusammen mit dem Paket PREMIUM buchbar!');
			document.getElementsByName("paket_plus")[0].checked = false;
			document.getElementsByName("paket_plus2")[0].checked = false;
		}
	} 
}

function navigation_laden(auswahl) {
   var arg = navigation_laden.arguments;
   var v = auswahl.options[auswahl.selectedIndex].value;
   if (arg.length > 1) {
      var w = arg[1];
   } else {
      var w = self;
   }
   if (v != "" && v != "#") {
      w.location.href = v;
   }
}