Ajax无刷新实现图片切换特效

一、AjaxMethod
using System;
using System.Data;
using System.Data.SqlClient;

namespace AjaxImage
{
    /**//// <summary>
    /// AjaxMethod 的摘要说明。
    /// </summary>
    public class AjaxMethod
    {
        public AjaxMethod()
        {           
        }
        public static string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"].ToString();

        GetDataSet#region GetDataSet
        public static DataSet GetDataSet(string sql)
        {
            SqlDataAdapter sda = new SqlDataAdapter(sql, ConnectionString);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            if (ds != null)
                return ds;
            else
                return null;
        }
        #endregion

        [AjaxPro.AjaxMethod]
        public static DataSet GetPhotoList( int iCategoryID )
        {
            string sql = "Select id,photo_path FROM Photo where photo_category_id=" + iCategoryID ;
            return GetDataSet( sql );
        }
        [AjaxPro.AjaxMethod]
        public static DataSet GetPhotoInfo( int id )
        {
            string sql = string.Format("SELECT photo_title, photo_description FROM Photo WHERE id = {0}", id);
            return GetDataSet( sql );
        }

    }//end class
}

二、页面HTML代码：
<div id="Layer1" style="Z-INDEX:1; LEFT:104px; WIDTH:501px; POSITION:absolute; TOP:28px; HEIGHT:345px">
                <img name="slideShow" src="/UploadFile/200804/13/D1104423862.gif" width="500" height="300" style="FILTER:revealTrans(duration=2,tra