function InitTree(Id, sId) {
    if (!document.getElementById) return;

    var ul = document.getElementById(Id);
    if ( ul == null || !ul.childNodes || ul.childNodes.length == 0 || (ul.childNodes.length == 1 && ul.childNodes[0].id == "empty"))
        return;

    // Expand first menu item if none is opened yet
    var boolMenuOpen = 0;
    for (var i = 0; i < ul.childNodes.length; i++) {
        var li = ul.childNodes[i];
        if (li.className.indexOf("current") != -1) {
            boolMenuOpen = 1;
            break;
        }
        if (li.childNodes != null && li.childNodes.length >= 1) {
            var subul = li.childNodes[1];
            if (subul != null && subul.className == "open") {
                boolMenuOpen = 1;
                break;
            }
        }
    }
    if (boolMenuOpen == 0 && ul.childNodes.length > 0)
        if (ul.childNodes[0].childNodes.length >= 2)
        ul.childNodes[0].childNodes[1].className = "open";

    // Expand opened menu items
    var node = document.getElementById(sId)
    if (node != null) {
        if (node.childNodes != null || node.childNodes.length >= 1) {
            var subul = node.childNodes[1];
            if (subul != null) subul.className = "open";
        }

        //show parentnodes
        while (node.parentNode && node.parentNode.id != Id) {
            if (node.nodeName == 'LI') {
                node.parentNode.className = "open";
            }

            node = node.parentNode;
        }

        var a = ul.getElementsByTagName('A');
        for (var i = 0; i < a.length; i++) {
            a[i].onclick = expandNode;
        }
    }
}

function expandNode(e, node) {
    if (!node) node = this;

    // show sibling ul
    var ul = node.nextSibling;
    if (ul != null) ul.className = "open";
}