title: remove unbind attribute in jquery
body: <p>I disabled the click event of image using unbind method. But I don't know how to recover the click event again.
  Here is the code,</p>
  
  <p><code>&lt;img src="testimg.jpg" id="sub_form"&gt;</code></p>
  
  <p>disabled the click event of above image using the code </p>
  
  <pre><code>$('#sub_form').unbind('click');
  </code></pre>
  
  <p>How do i recover the click event? I tried with the bind event </p>
  
  <pre><code>  $('#sub_form').bind('click');
  </code></pre>
  
  <p>but it wont work. </p>
  
  <p>Why I'm going for click event of image is ajax form submission. The code is,</p>
  
  <pre><code>$("#sub_form").click(function() {
  var input_data = $('#testform').serialize();
      $.ajax({ 
  //my code
  });
  });
  </code></pre>
  
  <p>how can i achieve this after unbind of image is performed.</p>