function isItemQuantity(evt) {
        var charCode = (evt.which) ? evt.which : event.keyCode
        if (charCode > 31 && (charCode < 48 || charCode > 57) && (charCode < 65 || charCode > 90) && (charCode < 97 || charCode > 122) && charCode != 95 && charCode != 45 && charCode != 47)
            return false;
        return true;
}