var ref = window.location.href;
  var i = ref.indexOf('?');
  var today = new Date();
 
  var IsChristmas = false; //at christmas comment this out and uncomment lines below
  //var IsChristmas = true;
  //if (today.getFullYear() > 2007) IsChristmas = false;

  if ( i >= 0 ) {
     var adKey = unescape(ref.substring(i+1));
     if (document.cookie.indexOf(adKey) == -1) {
       var exp = new Date();
       adKey+=" "+(exp.getMonth()+1)+"/"+exp.getDate()+"/"+exp.getFullYear();
       var OneMonthFromNow = exp.getTime() + (30 * 24 * 60 * 60 * 1000 );
       exp.setTime(OneMonthFromNow);
       document.cookie = "adSource="+adKey+"; expires="+exp.toGMTString();
     }
  }
  function GetLastModified() {
    var lastMod = new Date(document.lastModified);
    var theMonth = lastMod.getMonth() + 1;
    var theYear = lastMod.getYear();
    var theDay = lastMod.getDate();
    var mn = new Array(12);
    mn[1] = 'January';
    mn[2] = 'February';
    mn[3] = 'March';
    mn[4] = 'April';
    mn[5] = 'May';
    mn[6] = 'June';
    mn[7] = 'July';
    mn[8] = 'August';
    mn[9] = 'September';
    mn[10] = 'October';
    mn[11] = 'November';
    mn[12] = 'December';
    return (mn[theMonth]+', '+theDay+' '+theYear);
  }