function saveCookie(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;
}

function textSize(size) {
  if (!size) {
    size = readCookie("fontsize");
  }
  var content = document.getElementById('content');
  if (content && size) {
    if (content.style.fontSize && parseInt(content.style.fontSize) + size < 20 && parseInt(content.style.fontSize) + size > 8) {
      content.style.fontSize = parseInt(content.style.fontSize) + size + "px";
    } else if (!content.style.fontSize) {
      content.style.fontSize = 12 + parseInt(size) + "px";
    }
    size = parseInt(content.style.fontSize) - 12;
    saveCookie("fontsize", size);
  }
}

function showNaarTop() {
  var naartop = document.getElementById("naartop");
  if (naartop) {
    naartop.style.display = "inline";
    window.onscroll = null;
  }
}