        <!--
        var speed=50; //数字越大速度越慢
        var tabs=document.getElementById("demos");
        var tabs1=document.getElementById("demos1");
        var tabs2=document.getElementById("demos2");
        tabs2.innerHTML=tabs1.innerHTML;
        function Marquee(){
        if(tabs2.offsetWidth-tabs.scrollLeft<=0)
        tabs.scrollLeft-=tabs1.offsetWidth
        else{
        tabs.scrollLeft++;
        }
        }
        var MyMar=setInterval(Marquee,speed);
        //tabs.onmouseover=function() {clearInterval(MyMar)};
        //tabs.onmouseout=function() {MyMar=setInterval(Marquee,speed)};
        -->