var TREE_NODES = [
    ["Exploring Internet", "http://www.cs.uml.edu/~pkrolak/index.html", "MainPage"],
    ["Getting Started", "http://www.cs.uml.edu/~pkrolak/GettingStarted/GettingStarted.html", "MainPage"],
    ["Internet Communication", "http://www.cs.uml.edu/~pkrolak/lab1/lab1.html", "MainPage", 
        ["Email", "lab1/email.html", "MainPage"],
        ["Chat", "/lab1/chat.html", "MainPage"],
        ["Newsgroup", "/lab1/newgroups.html", "MainPage"],
        ["Instant Messengers", "/lab1/IM.html", "MainPage"]
    ],
    ["Creating Website", "http://www.cs.uml.edu/~pkrolak/lab2/lab2.html", "MainPage"],
    ["HTML", "http://www.cs.uml.edu/~pkrolak/lab3/lab3.html", "MainPage"]
];