JQuery Tutorial 31 - How to select previous element or prev function with an example

Code:
<html lang="en">
<head>
 <title>JQueryexamplecode.blogspot.com</title>
   <script src="js/jquery.js" type="text/javascript"></script>
</head>
<body>
 <a href="https://www.blogger.com/blogger.g?blogID=6795235206473427689#" id="disableNext"> disable next element</a>

 <button id="btnRegister">Register</button>
 
 <a href="https://www.blogger.com/blogger.g?blogID=6795235206473427689#" id="EnablePrevious"> Enable previous element</a>
 <script>
  $('#disableNext').click(function(){
   $(this).next().attr('disabled',true);
  })
  $('#EnablePrevious').click(function(){
   $(this).prev().removeAttr('disabled');
  })
 </script>
</body>                                                                                  
</html>
Output:
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