lastSelectProductAdded = 'temp';
$(document).ready(function(){
    $('.add_prod_options select').change(function(){
        var optionValue = $(this).children('option:selected').attr('value');
        var optionName = $(this).children('option:selected').attr('name');
        if (lastSelectProductAdded != optionName) {
            if (optionValue.length > 0) {
                $(this).parent().parent().parent().submit();
            }
            else {
                var sw_list = $('#stock_warning_list');
                sw_list.html('');
                sw_list.append("<li>" + $(this).children('option:selected').attr('name') + "</li>");
                $('.stock_warning').fadeIn("slow");
                setTimeout(function() {$('.stock_warning').fadeOut(2000);}, 2500);
            }                
        }
        lastSelectProductAdded = optionName;
    });
});