How to change Visibility of Div
<p>I want to change visibility of DIV on pressing of button . whats wrong with this code 
    
    
      </p>

<pre><code>     &lt;p id="myP"&gt;This is a p element.&lt;/p&gt;

     &lt;button type="button" onclick="myFunction()"&gt;Hide content of p&lt;/button&gt;

     &lt;script&gt;
        function myFunction() {
           var which= document.getElementById("myP");

          if (which.style.visibility=="visible")
              which.style.visibility = "hidden"
          else
              which.style.visibility = "visible"
        }

     &lt;/script&gt;

  &lt;/body&gt;
</code></pre>

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