function startHighlight(img)
{
    imgobj = img;
    highlightInterval = setInterval('imageHighlight(imgobj)', 50);
}

function imageHighlight(img)
{
    if (img.filters.alpha.opacity < 100)
        img.filters.alpha.opacity += 20;
    else if (window.highlightInterval)
        clearInterval(highlightInterval);
}

function imageDim(img)
{
    clearInterval(highlightInterval);
    img.filters.alpha.opacity = 50;
}