var position = 0;

function $(obj)
{
    return document.getElementById(obj);
}

function startSlideShow()
{
    $("twinSlider").innerHTML = $("slider").innerHTML;
    $("twinSlider").style.top = (0-$("slider").offsetHeight) + "px";
    $("twinSlider").style.width = $("slider").offsetWidth + "px";
    slideFrame();
}

function slideFrame()
{
    $("slider").style.left = (- position) + "px";
    $("twinSlider").style.left = (- position + $("slider").offsetWidth) + "px";

    position = position + 2;

    if (position > $("slider").offsetWidth) {
        position = 0;
    }
    setTimeout("slideFrame()", 40);
}