$(function() {
  onItemNameChange($("#item-name").get(0));
  $("#item-name").change(function(){
    onItemNameChange(this);
  });
  $(".toggle").click(function(){
    var id = this.hash.substr(1);
    var lyricsSelector = "#" + id;
    var linkSelector = "#show-" + id;
    $(lyricsSelector).toggle();
    if($(lyricsSelector).is(":visible")) {
      $(linkSelector).hide();
    } else {
      $(linkSelector).show();
    }
    return false;
  });
});

function onItemNameChange(el) {
  if(el) {
    var number = el.options[el.selectedIndex].title;
    var total = number * $("#input-each-price").text();
    $("#output-total-price").text(total);
    $("#amount").val(total);    
  }
}