function check_ppc_ref() {
  ref_type = location.href.split("ppc_ref=")[1];
  if (ref_type == undefined) {
	return true;
  } 
  ref_type = ref_type.substring(0,3);
  if (ref_type == "gaw") {
    initbox();
  }
  else if (ref_type == "ysm") {
    initbox();
  }
  return true;
}

function return_ppc_discount_name() {
  ref_type = location.href.split("ppc_ref=")[1];
  if (ref_type == undefined) {
	return;
  } 
  ref_type = ref_type.substring(0,3);
  if (ref_type == "gaw") {
    return "Google";
  }
  else if (ref_type == "ysm") {
	return "Yahoo";
  }
}

function return_ppc_discount_code() {
  ref_type = location.href.split("ppc_ref=")[1];
  if (ref_type == undefined) {
	return;
  } 
  ref_type = ref_type.substring(0,3);
  if (ref_type == "gaw") {
    return "G245";
  }
  else if (ref_type == "ysm") {
	return "Y421";
  }
}