function Toggle(node) {
    // Unfold the branch if it isn't visible
    if (node.nextSibling.style.display == 'none') {
        // Change the image (if there is an image)
        if (node.childNodes.length > 0) {
            if (node.childNodes.item(0).nodeName == "IMG") {
                node.childNodes.item(0).src = "minus.gif";
            }
        }

        node.nextSibling.style.display = 'block';
    }
    // Collapse the branch if it IS visible
    else {
        // Change the image (if there is an image)
        if (node.childNodes.length > 0) {
            if (node.childNodes.item(0).nodeName == "IMG") {
                node.childNodes.item(0).src = "plus.gif";
            }
        }

        node.nextSibling.style.display = 'none';
    }
}