$(document).ready(function()
{
  $('.thumbnail').each(function()
  {
    $(this).hover(
      function()
      {
        $(this).children('.user_photo_container').children('.thumbnail_hover_info').slideDown(200);
      },
      function()
      {
        $(this).children('.user_photo_container').children('.thumbnail_hover_info').slideUp(200);
      }
    );
  });
});