function addNode()
{       
    if(typeof tree_selected_id == "undefined")
    {
        alert("Please select a parent for the new node");
        return;
    }
    if(document.getElementById("sNodeHtml").value == "")
    {
        alert("Please enter the text of the node");
        return;
    }
    ob_t2_Add(tree_selected_id, "added_" + (parseInt(Math.random() * 100000000)).toString(), document.getElementById("sNodeHtml").value, 1, "Folder.gif", null);
    document.getElementById("sNodeHtml").value = "";
}