$(function() {
  var caption = $(".caption")
  var default_text = caption.html()
  
  $("a[rollover_text]").each(function() {
    $(this).hover(
      function() {
        caption.html($(this).attr("rollover_text"))
      },
      function() {
        caption.html(default_text)
      }
    )
  })
})