function toggledisplay(item, image) {
    var item = document.getElementById(item);
    if (item.style.display != "block") {
        item.style.display = "block";
        image.src = "http://geoportal.icimod.org/MGP/images/ico/arrow_down.png";
    }
    else {
        item.style.display = "none";
        image.src = "http://geoportal.icimod.org/MGP/images/ico/arrow_right.png";
    }
}