$.fn.jRound = function()  {
  // Round corner images
  var round_corner = '<span class="top_left"><img src="img/top_left.png" alt="" /></span><span class="top_right"><img src="img/top_right.png" alt="" /></span>';
  
  // Append code
  $(this).each(function() {
    $(this).append(round_corner);
  });
}

$(document).ready(function()  {
  $(".round").jRound();
});