title: jQuery combox value change hide button
body: <p>I want to emulate the following scenario:</p>
  
  <ul>
  <li>if  <code>combox</code> is equal to <code>0</code> hide the button</li>
  <li>else if <code>combox</code> is equal to <code>1,2,3...</code> show the button</li>
  </ul>
  
  <p>I have tried the following:</p>
  
  <pre><code>$('#Variant1').val().change(function(){
    if (val === 0) {
      $('#startbtn').hide();
    } else {
      $('#startbtn').show();
    } 
  });
  </code></pre>