function item_add(tag){
  var name = tag.id;
  window.location.href = "./modify/item_add.php?name=" + name;
}

function item_subtract(tag){
    var name = tag.id;
    window.location.href = "./modify/item_subtract.php?name=" + name;
}

function item_del(tag){
    var name = tag.id;
    window.location.href = "./modify/item_del.php?name=" + name;
}

function item_modify(tag){
    var name = tag.id;
    var quantity = tag.value;
    window.location.href = "./modify/item_modify.php?name=" + name + "&quantity=" + quantity;
}

function item_checkup_add(tag){
    var name = tag.id;
    window.location.href = "./modify/item_checkup_add.php?name=" + name;
}

function item_checkup_subtract(tag){
    var name = tag.id;
    window.location.href = "./modify/item_checkup_subtract.php?name=" + name;
}

function item_checkup_modify(tag){
    var name = tag.id;
    var quantity = tag.value;
    window.location.href = "./modify/item_checkup_modify.php?name=" + name + "&quantity=" + quantity;
}