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

function really (url, text) {
	if (confirm(text)) {
		window.open(url,"_self");
	}
};

function changeFontSize(sizeDifference){
	currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference)*10;
	if(currentFontSize > 200){
		currentFontSize = 200;
	} else if(currentFontSize < 60){
		currentFontSize = 60;
	}
	setFontSize(currentFontSize);
};

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

function setFontSize(fontSize){
	document.body.className = 'z' + fontSize;
//	alert (' neu: ' + document.body.className);

};

function toggleColors(){
	if(currentStyle == "White"){
		setColor("Black");
	}else{
		setColor("White");
	}
};

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);

		prefsLoaded = true;
	}

};

window.onunload = saveSettings;

function saveSettings()
{
  createCookie("fontSize", currentFontSize, 365);
};