title: scrape ASIN from amazon URL using javascript
body: <p>Assuming I have an Amazon product URL like so</p>
  
  <pre><code>http://www.amazon.com/Kindle-Wireless-Reading-Display-Generation/dp/B0015T963C/ref=amb_link_86123711_2?pf_rd_m=ATVPDKIKX0DER&amp;pf_rd_s=center-1&amp;pf_rd_r=0AY9N5GXRYHCADJP5P0V&amp;pf_rd_t=101&amp;pf_rd_p=500528151&amp;pf_rd_i=507846
  </code></pre>
  
  <p>How could I scrape just the <a href="http://en.wikipedia.org/wiki/Amazon_Standard_Identification_Number" rel="noreferrer">ASIN</a> using javascript?
  Thanks!</p>