function order_calculate(value) {

    value = parseInt(value);

    var order_count;
    order_count = value * 1;

    if(order_count != value || value == '') {
        value = 0;
    }

    var price_currency;
    var price_one;
    var currency;

    price_currency = document.getElementById('item_price').value;

    price_currency = price_currency.split(' ');
    price_one = price_currency['0'];
    currency = price_currency['1'];

    price_currency = price_one * value;
    price_currency = price_currency.toFixed(2);
    price_currency = price_currency + ' ' + currency;

    document.getElementById('item_price_all').value = price_currency;
}