var ref = window.location.href;
  var i = ref.indexOf('?');
  var today = new Date();
 

  if ( i >= 0 ) {
     var adKey = unescape(ref.substring(i+1));
     if (document.cookie.indexOf(adKey) == -1) {
      storeAdword(adKey);
     }
  }

function storeAdword(aw) {
       var exp = new Date();
       aw+=" "+(exp.getMonth()+1)+"/"+exp.getDate()+"/"+exp.getFullYear();
       var OneMonthFromNow = exp.getTime() + (30 * 24 * 60 * 60 * 1000 );
       exp.setTime(OneMonthFromNow);
       document.cookie = "adSource="+aw+";path=/;expires="+exp.toGMTString();
}