Syntax error on if-else Javascript statement
<p>I'm fairly new to JavaScript so I don't quite understand why I am getting a syntax error on 'else'. Any advise?</p>

<pre><code>&lt;script language="javascript"&gt;
 $(document).ready(function() {
      $('#toggleButton').click(function() {
           if ($('#toggleSection').css("opacity") == 0); {  
                $('#toggleSection').fadeIn("slow");
           } 
           else {
                $('#toggleSection').fadeOut("slow");
           }
           return false;
      });
 });
 &lt;/script&gt;
</code></pre>
