var imgUrlad = new Array();
        var imgLinkad = new Array();
        imgUrlad[0] = "http://www.chinameirong.com/images/675X80.gif";
        imgUrlad[1] = "http://www.chinameirong.com/images/675X801.gif";
        imgLinkad[0] = "http://www.chinameirong.com/ZC.aspx";
        imgLinkad[1] = "http://www.chinameirong.com/shibo.html";
        
          function setImagead()
        {
            setImageListad();
            setInterval("setImageListad()",5000);
        }
        
        var cindexad = 1;
        function setImageListad()
        {
            var imgad = document.getElementById("imgad");
            document.getElementById("imgLinkad").href = imgLinkad[cindexad-1];
            
            imgad.src=imgUrlad[cindexad-1];
            cindexad++;
            if (cindexad >= 3)
            {
                cindexad=1;
            }
        }