var prefsLoaded = false;
var defaultFontSize = 100;
var currentFontSize = defaultFontSize;

function revertStyles(){
currentFontSize = defaultFontSize;
changeSize(0);
}


function changeSize(sizeDifference){
currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference * 5);
if(currentFontSize > 130){
currentFontSize = 130;
}else if(currentFontSize < 80){
currentFontSize = 80;
}


setFontSize(currentFontSize);
};
function setFontSize(fontSize){
var stObj = (document.getElementById) ? document.getElementById('Inhalt') : document.all('Inhalt');
document.body.style.fontSize = fontSize + '%';
};
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=/";
};
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;
};
window.onload = setUserOptions;
function setUserOptions(){
if(!prefsLoaded){
cookie = readCookie("fontSize");
currentFontSize = cookie ? cookie : defaultFontSize;
setFontSize(currentFontSize);
}
}
window.onunload = saveSettings;
function saveSettings()
{
  createCookie("fontSize", currentFontSize, 365);
}