js/treemenu.js

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var openImg = new Image();
var closedImg = new Image();

function showBranch(branch) {
    var objBranch = document.getElementById(branch).style;
    if (objBranch.display == "block")
        objBranch.display = "none";
    else
        objBranch.display = "block";
    swapFolder('I' + branch);
}

function swapFolder(img) {
    objImg = document.getElementById(img);
    if (objImg.src.indexOf('closed.gif') > -1)
        objImg.src = openImg.src;
    else
        objImg.src = closedImg.src;
}
function tree() {
    this.branches = new Array();
    this.add = addBranch;
    this.write = writeTree;

    this.GetBranchSize = GetBranchSize;
}

function GetBranchSize() {
    return this.branches.length;
}

function addBranch(branch) {
    this.branches[this.branches.length] = branch;
}

function writeTree() {
    var treeString = '';
    var numBranches = this.branches.length;
    for (var i = 0; i < numBranches; i++)
        treeString += this.branches[i].write();
    document.write(treeString);
}
function branch(id, text) {
    this.id = id;
    this.text = text;
    this.write = writeBranch;
    this.add = addLeaf;
    this.leaves = new Array();
}
function addLeaf(leaf) {
    this.leaves[this.leaves.length] = leaf;
}

function writeBranch() {
    var branchString = '<span  class="branch"' + 'onClick="showBranch(\'' + this.id + '\')"';
    branchString += '><img width=15 height=15 src="images/closed.gif" id="I' + this.id + '" />&nbsp;&nbsp;' + this.text;

    branchString += '</span>';
    branchString += '<span class="leaf" id="';
    branchString += this.id + '">';