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    //Create a new ST instance
    var st = new $jit.ST({
        'injectInto': 'infovis',
        //set duration for the animation
        duration: 800,
        //set animation transition type
        transition: $jit.Trans.Quart.easeInOut,
        //set distance between node and its children
        levelDistance: 50,
        //set max levels to show. Useful when used with
        //the request method for requesting trees of specific depth
        levelsToShow: 2,
        //set node and edge styles
        //set overridable=true for styling individual
        //nodes or edges
        Node: {
            height: 20,
            width: 40,
            //use a custom
            //node rendering function
            type: 'nodeline',
            color:'#23A4FF',
            lineWidth: 2,
            align:"center",
            overridable: true
        },
        
        Edge: {
            type: 'bezier',
            lineWidth: 2,
            color:'#23A4FF',
            overridable: true
        },
        
        //Add a request method for requesting on-demand json trees. 
        //This method gets called when a node
        //is clicked and its subtree has a smaller depth
        //than the one specified by the levelsToShow parameter.
        //In that case a subtree is requested and is added to the dataset.
        //This method is asynchronous, so you can make an Ajax request for that
        //subtree and then handle it to the onComplete callback.
        //Here we just use a client-side tree generator (the getTree function).
        request: function(nodeId, level, onComplete) {
          var ans = getTree(nodeId, level);
          onComplete.onComplete(nodeId, ans);  
        },
        
        onBeforeCompute: function(node){
            Log.write("loading " + node.name);
        },
        
        onAfterCompute: function(){
            Log.write("done");
        },
        
        //This method is called on DOM label creation.
        //Use this method to add event handlers and styles to
        //your node.
        onCreateLabel: function(label, node){
            label.id = node.id;            
            label.innerHTML = node.name;
            label.onclick = function(){
                st.onClick(node.id);
            };
            //set label styles
            var style = label.style;
            style.width = 40 + 'px';
            style.height = 17 + 'px';            
            style.cursor = 'pointer';
            style.color = '#fff';
            //style.backgroundColor = '#1a1a1a';
            style.fontSize = '0.8em';
            style.textAlign= 'center';
            style.textDecoration = 'underline';
            style.paddingTop = '3px';
        },
        
        //This method is called right before plotting
        //a node. It's useful for changing an individual node
        //style properties before plotting it.
        //The data properties prefixed with a dollar
        //sign will override the global node style properties.
        onBeforePlotNode: function(node){
            //add some color to the nodes in the path between the
            //root node and the selected node.
            if (node.selected) {
                node.data.$color = "#ff7";
            }
            else {
                delete node.data.$color;
            }
        },
        
        //This method is called right before plotting
        //an edge. It's useful for changing an individual edge
        //style properties before plotting it.
        //Edge data proprties prefixed with a dollar sign will
        //override the Edge global style properties.
        onBeforePlotLine: function(adj){
            if (adj.nodeFrom.selected && adj.nodeTo.selected) {
                adj.data.$color = "#eed";
                adj.data.$lineWidth = 3;
            }
            else {
                delete adj.data.$color;
                delete adj.data.$lineWidth;
            }
        }
    });
    //load json data
    st.loadJSON(eval( '(' + json + ')' ));
    //compute node positions and layout
    st.compute();
    //emulate a click on the root node.
    st.onClick(st.root);