function gundong(v,speed) {
    function marquee(demo, demo1, demo2) {
        var scl = demo.scrollleft;
        if (demo2.offsetwidth - demo.scrollleft <= 0)
            demo.scrollleft -= demo1.offsetwidth
        else {
            demo.scrollleft++;
            if (scl == demo.scrollleft) {
                demo.scrollleft = 0;
            }
        
         }
    }
    if (speed == null||parseint(speed)==nan)
        speed = 15;
    var speed3 = speed; //�ٶ���ֵխ���ٶ�խ��
    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) }
}