function setFontsize(size) {
	this.w3c = (document.getElementById);
	this.body = (this.w3c)?document.getElementsByTagName('body')[0].style:document.all.tags('body')[0].style;
	this.body.fontSize = size + '%';
	createCookie("fontsize", size, 365);
	
	
}

function getPreferredFontsize() {
	var cookie = readCookie("fontsize");
	
	if(!cookie){ cookie = "undefined"; }
	
	// Überprüfen, ob Cookie Zahl
	var chkZ = 1;
	for (i = 0; i < cookie.length; ++i)
    if (cookie.charAt(i) < "0" ||
        cookie.charAt(i) > "9")
      chkZ = -1;
  
  // Wenn Cookie (noch) nicht gesetzt oder keine Zahl --> Standardwert 75;
  if (chkZ == -1) { return "75"; } else { return cookie; } 


}

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 = function(e) {
  var size = getPreferredFontsize();
  setFontsize(size);
  
}

var size = getPreferredFontsize();
setFontsize(size);
if(document.getElementById('fs'+size)){ document.getElementById('fs'+size).checked = true; }