var tree; 
function treeInit(divName) { 
    tree = new YAHOO.widget.TreeView(divName); 
    
    //tree.expandAll();
    //tree.root.expand();
    tree.render();
    
    //ReplaceBrackets(tree.root.children[0]);
    
    tree.collapseAll();
    tree.root.expand();
    tree.root.children[0].expand();
    
} 

function ReplaceBrackets(node){
    var currHTML = node.getContentEl().innerHTML;
    
    var newHTML = currHTML.replace(/\{/g, "<").replace(/\}/g, ">");
    
    node.getContentEl().innerHTML = newHTML;
    
    for (var i=0; i<node.children.length; i++){
        ReplaceBrackets(node.children[i]);
    }
}