jquery focus in show an element

$j(document).ready(function (){
 
      $j(".focus-bubble input").focusin(function () {
          $j(this).closest(".focus-bubble").children(".bubble").addClass("isVisible");        
        });        
      $j(".focus-bubble input").focusout(function () {
          $j(this).closest(".focus-bubble").children(".bubble").removeClass("isVisible");        
        });        
    });