title: js for redirecting page on condition
body: <p>I think having searched, sorry if my question has already been answered.</p>
  <p>My website static HP (/index.html) is divided into sections:</p>
  <h1>info, #bib, #cat ...</h1>
  <p>and sofar, not to display an empty page, it redirects to the #info section like this:</p>
  <pre><code>&lt;body onload=&quot;window.location.href = 'index.html#info';&quot;&gt;
  </code></pre>
  <p>I'd very much need the redirection to happen <em>only</em> when visitors come from another site.</p>
  <p>I mean, i can set links in other pages pointing to the #cat or #bib sections, but like this only the #info section shall display.</p>
  <p>Is that possible? How can i get it?
  Thanks in advance
  A.</p>