function getCookie(name) {
allCookies = document.cookie;
cookieArr  = allCookies.split(';');
for(var i=0;i<cookieArr.length;i++) {
    if(cookieArr[i].split('=')[0] == name) {
      cookieValue=cookieArr[i].split('=');
        cookieValue=unescape(cookieValue[1]);
         return cookieValue;
      }
    }
    return false;
}
function fontSize(size)
{
  document.getElementById('center').style.fontSize = size + 'em';
  document.cookie = "fontSize=" + size;
  document.getElementById(size.replace(".", "_"));
}
function initSize() {
  if (getCookie('fontSize')) {
    fontSize(getCookie('fontSize'));
  } else {
    fontSize('0.9');
  }
}