/* Fontgroesse aendern!! 
 Originalseite: http://alistapart.com/articles/relafont
*/
// Fonts vergroessern
function fontsizeup() {
  active = getActiveStyleSheet();
  switch (active) {
    case '94' : 
      setActiveStyleSheet('96');
      break;
    case '96' : 
      setActiveStyleSheet('98');
      break;
    case '98' : 
      setActiveStyleSheet('100');
      break;
    case '100' : 
      setActiveStyleSheet('102');
      break;
    case '102' : 
      setActiveStyleSheet('104');
      break;
    case '104' : 
      setActiveStyleSheet('106');
      break;	  
    case '106' :
      break;
    default :
      setActiveStyleSheet('100');
      break;
  }
}

// Fonts verkleinern
function fontsizedown() {
  active = getActiveStyleSheet();
  switch (active) {
    case '106' : 
      setActiveStyleSheet('104');
      break;
    case '104' : 
      setActiveStyleSheet('102');
      break;
    case '102' : 
      setActiveStyleSheet('100');
      break;
    case '100' : 
      setActiveStyleSheet('98');
      break;
    case '98' : 
      setActiveStyleSheet('96');
      break;
    case '96' : 
      setActiveStyleSheet('94');
      break;
    case '94' : 
       break;
    default :
      setActiveStyleSheet('100');
      break;
  }
}

// Stylesheet setzen
function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

// aktiven Stylesheet auslesen
function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

// Standard Stylesheet
function getPreferredStyleSheet() {
  return ('100');
}

// Cookie setzen/aktualisieren
function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

// 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;
}

// Cookie laden bei neuaufruf
window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

// Cookie speichern
window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

// anzuzeigenden Style auslesen
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
if (title == 'null') {
  title = getPreferredStyleSheet();
}

// Style setzen
setActiveStyleSheet(title);

/* Ende Fontgroesse aendern!! */