How do I persist a TreePanel?

Ext its not out yet but here is the code:

YAHOO.ext.tree.TreePanel.prototype.toJsonString=function(){
var nodes=this.getRootNode().childNodes;
this.arrNodes=[{id:this.getRootNode().id,parent:0}];
  for(var i=0;i< nodes.length;i++){
       this.arrNodes.push({id:nodes[i].id,parent:this.getRootNode().id});
       this.processChildren(nodes[i]);
  }
  return YAHOO.ext.util.JSON.encode(this.arrNodes);
}
/*
    Recursive function 
    sweeps the tree in all levels
*/
YAHOO.ext.tree.TreePanel.prototype.processChildren=function(node){
   child=node.childNodes;
   for(var i=0;i<child.length;i++){
       this.arrNodes.push({id:child[i].id,parent:node.id});
       this.processChildren(child[i]);
   }
}

It returns a jsonString with an array of objects with the tree nodes and its parents reflecting the changed tree. When Ext comes out I will build a complete sample persisting that output to a database.

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