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getting error ---> too much recursion in mozilla, Stack overFlow in IE7

Trying to add child element by function aFunc(). It is adding child element infinite times

************************************************************************
function aFunc(id)
{                
    tree.insertNewChild("wwww","wwww/aaa","aaa",0,0,0,0,'SELECT');                
}

************************************************************************

tree=new dhtmlXTreeObject("treeboxbox_tree","100%","100%",0);
            tree.setImagePath("images/csh_yellowbooks/");
            tree.enableTreeImages("false");
            tree.enableTreeLines("false");
            tree.setOnClickHandler(tonclick);
                
            tree.setOnOpenHandler(aFunc);    

        
            tree.loadXML("http://www.aaa.com/userACxml/"+username+".xml");    

***************************************************************************


Kindly let me know how can I add child elements to parent node or element

In your code, each time when new item opened  , you are creating new item with the same ID, which will result in non unique IDs and may case infinite recursion, same as in your case. 
Please be sure that value , which used as ID of new item is unique per each item. 

No, I am giving unique ID only.

Parent ID -- wwww
Child ID -- wwww/aaa

in mozilla it is pointing to these error lines.. based on this can you assist me

   this.userData=new cObject(); from function dhtmlXTreeItemObject(itemId,itemText,parentObject,treeObject,actionHandler,mode){}
and 
 	this._setSrc=function(a,b){ a.src=b; } from dhtmlXTreeObject.prototype.enableIEImageFix=function(mode){} methods
   

Hope this helps to resolve my problem.

Previously was getting whole data from XML file.. but that was taking time to load my tree.. now I want to implement same thing by Ajax. mean I will get Fist level data from XML file, second level data want to add by  tree.insertNewChild(); so that my tree grow dynamically.

In your code snippet both parent and child IDs are hardcoded, so when such code will be executed for second time - it will cause non unique ID for child item. 
The correct code may look as 

function aFunc(id) 
{  
  var nid = (new Date()).valueOf();
  tree.insertNewChild(id,nid,"aaa",0,0,0,0,'SELECT');  
}

>>second level data want to add by tree.insertNewChild(); so that my tree grow dynamically.
You can use dyn. loading, when branches loaded from server side separatly, on-demand. 
                 http://dhtmlx.com/docs/products/dhtmlxTree/samples/loading_processing_data/tree_dyn_loading.html?un=1223908220000