var prefsLoaded = true;
var defaultFontSize = 12;
var currentFontSize = defaultFontSize;

function revertStyles(){

        currentFontSize = defaultFontSize;
        changeFontSize(0);

};

function changeFontSize(sizeDifference){
        currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference * 2);

        if(currentFontSize > 18){
                currentFontSize = 18;
        }else if(currentFontSize < 8){
                currentFontSize = 8;
        }

        setFontSize(currentFontSize);
};

function setFontSize(fontSize){

 if (document.all) {
                var tds = document.getElementsByTagName('TD');
        for (var i=0;i<tds.length;i++)
      tds[i].style.fontSize=fontSize+"px";

 } else if (document.getElementById) {
        var tds = document.getElementsByTagName('TD');
        for (var i=0;i<tds.length;i++)
      tds[i].style.fontSize=fontSize+"px";
 }
};

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=/";
};

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 = setUserOptions;

function setUserOptions(){
        if(!prefsLoaded){

                cookie = readCookie("fontSize");
                currentFontSize = cookie ? cookie : defaultFontSize;
                setFontSize(currentFontSize);

                prefsLoaded = true;
        }

};

window.onunload = saveSettings;

function saveSettings()
{
  createCookie("fontSize", currentFontSize, 365);
};