title: Cannot read property 'style' of null
body: <p>For some strange reason I get a weird error.</p>
  
  <p>I have an element (which I'd defined with PHP) that eventuly looks like this:</p>
  
  <pre><code>    &lt;span id="l_area_1_5" style="display: inline; "&gt;
  
      ...some html inputs and stuff....
  
      &lt;/span&gt;
  </code></pre>
  
  <p>Which I am certain by Inspect Element of the Chrome.</p>
  
  <p>Now when I try to address to it programaticly with this:</p>
  
  <pre><code>document.getElementById("1_area_1_5").style.display = 'none';
  </code></pre>
  
  <p>I get the <code>Cannot read property 'style' of null</code> error.</p>
  
  <p>I have no idea what the hell that's supposed to mean, any help?</p>