function addBook(asin) {

    if (!asin) {
	return false;
    }

    var url ='/api/book/add';
    var data = 'asin=' + asin;
    var area = $('item_' + asin + '_button');  

    new Ajax.Request(url, {
	method: 'post',
	parameters: data,
	onLoading: function() {
		area.innerHTML = '<img src="/images/icon/loading.gif" width="16" height="16" />';
	},
	onComplete: function(httpObj) {
	    
            if (httpObj.status == '200') {
		//var res = httpObj.responseText;
		area.innerHTML = '<a href="/edit/' + asin + '" class="btnRed">登録しました！</a>';
            }
            else {
		area.innerHTML = '<span class="error">エラー</span>';
            }
	}
    });

}