           <!--产品图片滚动插件
            var speed=30; //数字越大速度越慢
            var tab=document.getElementById("demo");
            var tab1=document.getElementById("demo1");
            var tab2=document.getElementById("demo2");
            tab2.innerHTML=tab1.innerHTML;
            function Marquee(){
            if(tab2.offsetWidth-tab.scrollLeft<=0)
            tab.scrollLeft-=tab1.offsetWidth
            else{
            tab.scrollLeft++;
            }
            }
            var MyMar=setInterval(Marquee,speed);
            tab.onmouseover=function() {clearInterval(MyMar)};
            tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)};
            -->