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Welcome to JS Bin
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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
<script>
  $(function(){
    $(".aulaRes").click(function activarBoton(){
      var $elem = $(this);
      $elem.siblings('.botReserva').attr('disabled',!$elem.is(':checked'));
    });
  });
</script>
  
  </head>
<body>
   <div>
    <input type="checkbox" name="aulaRes1" class="aulaRes" value="x"/>Prueba <br />
<button id="botReserva1" class="botReserva" disabled="disabled"> Reservar</button>
  </div>
  
</body>
</html>
 
if (document.getElementById('hello')) {
  document.getElementById('hello').innerHTML = 'Hello World - this was inserted using JavaScript';
}
Output

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