function toggleScroll(speed)
{
    isScrolling ^= true;
    scrollWin(speed);
}

function stopScroll()
{
    isScrolling = false;
}

function startScroll(speed)
{
    isScrolling = true;
    scrollWin(speed);
}

function scrollWin(speed)
{
    if (isScrolling)
    {
        setTimeout("scrollWin(" + speed + ")", speed);
        window.scrollBy(0,1);
    }
}

isScrolling = false;