var t;          
function changerTaille(modif) {
    if (isNaN(t)) t=0;
    if (modif==0) t=1;
    else t = (t*1) + (modif*1);
    document.getElementsByTagName("body")[0].style.fontSize = t + "em";     
    cCookie("style", t, 365);
}   

function cCookie(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 rCookie(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;
}

var cookie = rCookie("style");
var c = cookie ? cookie : 0;