Is there an on_tab_on2 event

Question

I have a thumb gallery where I can hover over each thumb to trigger an associated pop-up to appear, but I would like to be able to also tab through the thumbs and make the associated pop-ups appear... Any help on how to go about doing this?

function onhovering_and_tabbingon2() 
        {
            $(".box img").hover(  
  function () 
  { 
  var num = $(this).attr('id').replace('thumb_entry_No', '');

  $('#pop' + num).toggleClass('popup');

  // maybe set the tabbing position to here... ???
  },

  function () 
  {

    var num = $(this).attr('id').replace('thumb_entry_No', ''); 

     $('#pop' + num).toggleClass('popup');

  }
);


// todo:  try to show the popups when tabbing through the thumbs...
  $(".box img").on_tab_on2(  // on_tab_on2 ????
  function () {

  var num = $(this).attr('id').replace('thumb_entry_No', '');

  $('#pop' + num).toggleClass('popup');

  // alert("Thumb entry no. " + num + " was tabbed to..."); 


  // might also have to move the mouse pointer(if there is one) along also.... ???
  },

  function () {

  var num = $(this).attr('id').replace('thumb_entry_No', '');

  $('#pop' + num).toggleClass('popup');

  }
);

    }