$(document).ready(function(){
  add_poster_behavior();
})

function add_poster_behavior() {
  $('#poster_chooser li').click(function () {
    $('#poster_chooser li').removeClass();
    $(this).attr('class', 'selected');
    $('#poster_display').attr('src', '/images/posters/' + $(this).attr('id') + '.jpg');
    return false;
  });
  $('#poster_chooser li').mouseover(function () {
    if ($(this).attr('class') == 'selected') return false;
    $('#poster_chooser li').removeClass('hover');
    $(this).attr('class', 'hover');
    return false;
  });
}