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



function revertStyles(){
	currentFontSize = defaultFontSize;
	changeFontSize(0);
}
function changeFontSize(sizeDifference){
	currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference * 5);
	if(currentFontSize > 220){
		currentFontSize = 220;
	}else if(currentFontSize < 60){
		currentFontSize = 60;
	}
	setFontSize(currentFontSize);
};
function setFontSize(fontSize){
	// Mal im Ernst, Freunde: wozu brauchen wir das hier ...
	var stObj = (document.getElementById) ? document.getElementById('content_area') : document.all('content_area');
	// ... wenn am Ende dann doch die ganze Seite angepasst wird??? ;-)
	document.body.style.fontSize = fontSize + '%';
	//alert (document.body.style.fontSize);
};



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);
}