var version = navigator.appVersion;

var on_img = "tree_on.gif";
var off_img = "tree_off.gif";

function TreeView(x) {
    if (version.indexOf("Windows") != -1) {
        tree_id = document.getElementById("tree"+x).style;
        tree_img = document.getElementById("treeIMG"+x);
        if (tree_id.display == "block") {
            tree_id.display = "none";
            tree_img.src = on_img;
        }
        else {
            tree_id.display = "block";
            tree_img.src = off_img;
        }
    }
    return false
}