function Marquee(demo,demo1,demo2)
{
if(demo2.offsetWidth-demo.scrollLeft<=0)
demo.scrollLeft-=demo1.offsetWidth
else{demo.scrollLeft++}
}

function gundong(v)
{
var speed3=15//速度数值越大速度越慢
var demo=document.getElementById(v);
var demo1=document.getElementById(v + "_1");
var demo2=document.getElementById(v + "_2");

demo2.innerHTML=demo1.innerHTML;
//var MyMar=setInterval(Marquee(demo,demo1,demo2),speed3)

var MyMar=setInterval(function(){Marquee(demo,demo1,demo2);},speed3)

demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(function(){Marquee(demo,demo1,demo2);},speed3)}

}