wuhup

(function(d){
  var asin = d.getElementById('ASIN'), url;

  if (asin) {
    url = 'http://' + d.domain.split('.').slice(-2).join('.') + '/dp/' + asin.value;
    if (prompt('Short Amazon URL (hit OK to load):', url)) {
      window.location.href = url;
    }
  } else {
    alert("Can't find an Amazon product ID.");