function addBook(asin) {

    if (!asin) {
	return false;
    }

    var url ='/api/book/add';
    var data = 'asin=' + asin;

    new Ajax.Request(url, {
	method: 'post',
	parameters: data,
	onLoading: function() {
	    $('item_' + asin + '_button').innerHTML = '<img src="/images/icon/loading.gif" />';
	},
	onComplete: function(httpObj) {

            if (httpObj.status == '200') {
		//var res = httpObj.responseText;
		$('item_' + asin + '_add').hide();
		$('item_' + asin + '_edit').show();
		$('item_' + asin + '_flag').show();
		$('item_' + asin + '_label').show();
            }
            else {
		$('item_' + asin + '_button').innerHTML = "エラー";
		$('item_' + asin + '_button').setStyle({ 'color':'#d12f19' });
            }
	}
    });

}