<script type="text/javascript">
order_id=0;
$(function(){
    add_order_item();
    $("select[name='order[accommodation_type_id]']").change(function () {

    accommodation_type_id = $("select[name='order[accommodation_type_id]'] option:selected").val();

    $.getJSON("/differences",{accommodation_type_id:accommodation_type_id},get_differences);
    function get_differences(differences) {
          differences_options="";
          $.each(differences,function(i,val){
              differences_options+="<option value="+val.id+">"+val.name+"</option>";
              })
          $(".differences_selection").html(differences_options);
          price();
        }

    }).trigger('change');

    function price(){
    $("select[name^='order[order_items][difference_id][1]']").change(function () {
    //alert($("select[name^='order[order_items][difference_id]']").attr("name"));
    name=$(this).attr("name");
    difference_id = $("select[name='"+name+"'] option:selected").val();

    $.getJSON("/differences/"+difference_id+"/get_price",{date_begin:'2008-04-01',date_end:'2008-05-12'},get_price_amount);
    function get_price_amount(price_amount) {
          $("#order_order_items_price_"+order_id+" >span").html("стоимость: "+price_amount+"грн.");
          $("#order_order_items_price_"+order_id+" >input").val(price_amount);
        }

    }).trigger('change');
   }
});


function add_order_item(){

   accommodation_type_id = $("select[name='order[accommodation_type_id]'] option:selected").val();
        $.getJSON("/differences",{accommodation_type_id:accommodation_type_id},get_differences);
        function get_differences(differences) {
          order_id++;
          differences_selection="";
          differences_selection+="<select name='order[order_items][difference_id]["+order_id+"]' class='differences_selection'>";
          $.each(differences,function(i,val){
              differences_selection+="<option value="+val.id+">"+val.name+"</option>";
              })
          differences_selection+="</select>";
          $(differences_selection).appendTo("#differences");
          price="<div id='order_order_items_price_"+order_id+"'><span></span><input type='hidden' name='order[order_items][price]["+order_id+"]' /></div>";
          $(price).appendTo("#differences");
        }

}

</script>