title: JSLint says "missing radix parameter"
body: <p>I ran  JSLint on this JavaScript code and it said: </p>
  
  <blockquote>
    <p>Problem at line 32 character 30: Missing radix parameter.</p>
  </blockquote>
  
  <p>This is the code in question:</p>
  
  <pre><code>imageIndex = parseInt(id.substring(id.length - 1))-1;
  </code></pre>
  
  <p>What is wrong here?</p>