function showAdvSearch()
{
    if (document.getElementById("adv_search").style.display == "none")
    {
        document.getElementById("adv_search").style.display = "block";
    }
    else
    {
        document.getElementById("adv_search").style.display = "none";
    }
}


function changeMainImage(image)
{
    document.getElementById("main_image").src = image;
}