function scroll()
    {
        var speed3=30//速度数值越大速度越慢
        var demo  = document.getElementById("demo_0");
        var demo1 = document.getElementById("demo_1");
        var demo2 = document.getElementById("demo_2");
        demo2.innerHTML=demo1.innerHTML.replace("scrollTable","scrollTable2");
        document.getElementById("scrollTable").style.width = (document.getElementById("scrollTable").rows[0].cells.length)        

*parseInt((document.getElementById("scrollTable").rows[0].cells[0]).width);
        document.getElementById("scrollTable2").style.width = (document.getElementById("scrollTable2").rows[0].cells.length)        

*parseInt((document.getElementById("scrollTable2").rows[0].cells[0]).width);

        function Marquee(){
            if(demo2.offsetWidth-demo.scrollLeft<=0){
                demo.scrollLeft -= demo1.offsetWidth
	        }
            else{
                demo.scrollLeft++
            }
        }
        var MyMar=setInterval(Marquee,speed3)
        demo.onmouseover=function() {clearInterval(MyMar)}
        demo.onmouseout=function() {MyMar=setInterval(Marquee,speed3)}
        }