title: javascript indexOf check in if statement
body: <p>Having some difficulty getting this code to work. Essentially, I want to check if the referring url is coming from the /mobile directory and if not and the screen is a mobile device I want to redirect to the mobile site.</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
  if(window.location.href.indexOf("document.write(document.referrer)") &gt; -1 &amp;&amp;
      screen.width &lt;= 699) {
      document.location = "/mobile/mobile_home.asp";
  }
  
  &lt;/script&gt;
  </code></pre>
  
  <p>The code is currently placed in the head of the main home.asp.</p>