// Fonction creating 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=/";
}
// Fonction reading cookie
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 cookie = readCookie("textsizestyle");
  var sizecookie;
  sizecookie = cookie ? cookie : 1;
  document.getElementsByTagName("body")[0].style.fontSize = sizecookie + "em";
}

function normalTaille() {
  document.getElementsByTagName("body")[0].style.fontSize = 1 + "em";
  createCookie("textsizestyle", 1, 7);
}

// Bigger or smaller font-size function
function changerTaille(modif) {

	// Font-size bigger limit
	var Maxlimit;
	Maxlimit = 1.5; // 1.5 to prevent exploding the layout
	// Font-size dynamical
	var textsize;			
	textsize = 1;

	if((textsize<=Maxlimit && modif>0) || modif<0){
		textsize = textsize + modif;
		document.getElementsByTagName("body")[0].style.fontSize = textsize + "em";	
		createCookie("textsizestyle", textsize, 7);	
	}
}