//Vollbildschirmfenster öffnen
function fullscreenwindow(file) {
 fullscreenwindow = window.open(file);
}

// Navigationsleiste ein- bzw. ausblenden
function navclose() {
 document.getElementById('body').style.backgroundImage = 'none'
 document.getElementById('navopenlink').style.visibility = 'visible'
 document.getElementById('navcloselink').style.visibility = 'hidden'
 document.cookie = "Navigationsleiste=Navigationsleiste deaktiviert; path=/";
}

function navopen() {
 document.getElementById('body').style.backgroundImage = 'url(/Allgemein/background.jpg)'
 document.getElementById('navopenlink').style.visibility = 'hidden'
 document.getElementById('navcloselink').style.visibility = 'visible'
 var jetzt = new Date();
 document.cookie = "Navigationsleiste=Navigationsleiste deaktiviert; expires=Thu, 01-Jan-70 00:00:01 GMT; path=/"
}

// Navigationsleiste ein- bzw. ausblenden über index.php?page=einstellungen
function navigation(action) {
 if(action == "nothing") {
   document.forms["Navigationsleiste"].reset();
   document.forms["Navigationsleiste"].elements[0].blur();
   return;
 }
 else if(action == "oeffnen") {
  navopen();
 }
 else if(action == "schliessen") {
  navclose();
 }
}

// Cookie ausleses

function getCookieVal(offset) {
 var endstr = document.cookie.indexOf (";", offset);
 if(endstr == -1) { endstr = document.cookie.length; }
 return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie(name) {
 var arg  = name +"=";
 var alen  = arg.length;
 var clen   = document.cookie.length;
 var tCookie = document.cookie;

 var i = 0;
 while(i < clen) {
  var j = i + alen;
  if(tCookie.substring(i, j) == arg) { return getCookieVal(j); }
  i = tCookie.indexOf(" ", i) + 1;
  if(i == 0) { break;  }
 }
 return "";
}

// Navigation deaktivieren, wenn Cookie gesetzt
function readcookie() {
 if(GetCookie("Navigationsleiste") == "Navigationsleiste deaktiviert") {
  navclose();
 }
}