var ref_var = getURLParam("aff");
 var cookie_varname = "aff";
 if ( ref_var != "" && ref_var != null ) {
  var now = new Date();
  var expiretime = new Date(now.getTime() + (60 * 24 * 3600 * 1000));
  document.cookie = cookie_varname+"="+ref_var+"; expires="+expiretime.toGMTString()+";";
 }


function getURLParam(strParamName){
 var strReturn = "";
 var strHref = window.location.href;
 if ( strHref.indexOf("?") > -1 ){
  var strQueryString = strHref.substr(strHref.indexOf("?")).toLowerCase();
  var aQueryString = strQueryString.split("&");
  for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
   if ( aQueryString[iParam].indexOf(strParamName + "=") > -1 ){
    var aParam = aQueryString[iParam].split("=");
    strReturn = aParam[1];
    break;
   }
  }
 }
 return strReturn;
}