// prüfe, ob Cookie vorhanden
if (document.cookie != ""){
  c = document.cookie;
  //alert("Cookie :"+c);
  var bg_sound = readCookie('bgsound')
  /*
  if (bg_sound) {
	 alert("var bg_sound aus Cookie: "+bg_sound);
  }
  */
  // zerlege Cookie-String und hole Wert (eingeschlossen durch "__") aus Cookie
  /*
  sub1 = c.substring(c.search('__'));
  sub2 = sub1.substring(sub1.search('='));
  sub3 = sub2.substring(1,sub2.search('__'));
  */
  //bg_sound = sub3;
  //setCookie("true");
  if(bg_sound != "true" && bg_sound != "false"){
    bg_sound = "true";
  }
} else {
  // wenn nein, setze Wert auf true
  bg_sound = "true";  
  setCookie("true");
}

/* Cookie auslesen */
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}