var MyMarH = null;
var theWay = null;
var theSpeed = null;
function MarqueeLeft()
{
    if(document.getElementById("demoH2").offsetWidth-document.getElementById("demoH").scrollLeft<=0)
        //document.getElementById("demoH").scrollLeft-=document.getElementById("demoH1").offsetWidth;
        document.getElementById("demoH").scrollLeft -= document.getElementById("demoH1").offsetWidth-2;
    else
    {
        //document.getElementById("demoH").scrollLeft++;
        document.getElementById("demoH").scrollLeft = document.getElementById("demoH").scrollLeft + 3;
    }
}
function MarqueeRight()
{
    if(document.getElementById("demoH").scrollLeft<=0)
        document.getElementById("demoH").scrollLeft+=document.getElementById("demoH2").offsetWidth;
    else
    {
        document.getElementById("demoH").scrollLeft--;
    }
}
function myMarquee(d,s)
{
    //速度,数值越大越慢
    if (MyMarH != null)
    {
        clearInterval(MyMarH);
    }
    MyMarH = setInterval(d, s);
    document.getElementById("demoH").onmouseover = function () { clearInterval(MyMarH); };
    document.getElementById("demoH").onmouseout = function () { MyMarH = setInterval(theWay, theSpeed); };
}
function initH(aWay,aSpeed) {
    theWay = aWay;
    theSpeed = aSpeed;
    document.getElementById("demoH2").innerHTML=document.getElementById("demoH1").innerHTML;
    myMarquee(theWay, theSpeed);
}