title: Jquery : Append jquery variable to a class name
body: <p>My code </p>
  
  <pre><code>   $( ".attachPo" ).click(function() {
          alert($(this).attr('id'))   // prints 59
          var id = $(this).attr('id');
          $( '#attachPoForm_"+id+"').show();  // id name = attachPoForm_59
      });
  </code></pre>
  
  <p>but which does not work for me , what is the correct vay of appending jQuesy variable to a class or id name</p>