// Heinle's function for retrieving a cookie.
function getCookie(name){
  var cname = name + "=";
  var dc = document.cookie;
  if (dc.length > 0) {
    begin = dc.indexOf(cname);
    if (begin != -1) {
      begin += cname.length;
      end = dc.indexOf(";", begin);
      if (end == -1) end = dc.length;
        return unescape(dc.substring(begin, end));
    }
  }
  return null;
}

// An adaptation of Dorcht's function for setting a cookie.
function setCookie(name, value, expires, path, domain, secure) {
  document.cookie = name + "=" + escape(value) +
  ((expires == null) ? "" : "; expires=" + expires.toGMTString()) +
  ((path == null) ? "" : "; path=" + path) +
  ((domain == null) ? "" : "; domain=" + domain) +
  ((secure == null) ? "" : "; secure");
}

// An adaptation of Dorcht's function for deleting a cookie.
function delCookie (name,path,domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" +
    ((path == null) ? "" : "; path=" + path) +
    ((domain == null) ? "" : "; domain=" + domain) +
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}

var  currentSize = 100;

function setFontSize(ev, percentage, prevent)
{
  if (document.getElementsByTagName) {
    currentSize = percentage;
    document.getElementsByTagName("body")[0].style.fontSize = currentSize + '%';
    setCookie('fontSize', currentSize);
  }
}

function decreaseFontSize(ev)
{
  setFontSize(ev, currentSize / 1.08, true);
}

function defaultFontSize(ev)
{
  setFontSize(ev, 100, true);
}

function increaseFontSize(ev)
{
  setFontSize(ev, currentSize * 1.08, true);
}

function setDefaultFont() {
  if (size=getCookie('fontSize')) {
    setFontSize(null, size, true);
  }
}
var OnLoad = "setDefaultFont();";
window.onload = function() { eval(OnLoad); }