//图书购买
       function buy(bookid,bookName,price,discount,jk)
       {
         var obj = jk;
         if(!confirm('确定购买吗？'))
        { return;}
         
         waited(obj);
         
           $.post(
                "/Buy/XMLshopping.aspx",
                { Bookid: bookid, BookName: bookName, Price: price, Discount: discount  },
                function(xml) {
                    DDXCommon.ShowRequestedMsg(xml, window.location);
                },
                "xml"
            );
       }
     
     //确认框

     function waited(tarobj) {
        var p = $(tarobj).position();
        var top = p.top;
        var left = p.left; 
        var height = $(tarobj).height();
        $('#requestMsg').css('top', top + height + 5);
        $('#requestMsg').css('left', left);
        $('#requestMsg').attr('class', 'wait');
    }