Amazon short URL bookmarklet

amazon-short-url-bookmarklet.js

(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.");
  }
}(document));

// Bookmarklet:
// javascript:(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.");}}(document));

// Alternative bookmarklet generator:
// http://ted.mielczarek.org/code/mozilla/bookmarklet.html

updated to remove subdomains, like - smile.amazon.com - to make it shorter
(doesn't work on co.uk though)