load content into the same div two times

load content into the same div two times

hello,
in one page i have:
........
$("#tree_data").load("?", {action: 'EDIT_MENU_ITEM', menu_item_id: data.rslt.obj.attr('id'), nid: 3});
........
<div id="tree_data" style="padding: 0 5px 0 10px;"></div> 

html loading in  div "tree data". In this html i have submit button. i want click this button and change content in the same div "tree_data". in this html i have:
.......
$("#form_edit").submit(function(){  
            $.post(  
                "?action=EDIT_MENU_ITEM&submit=true&nid=<?php echo $_REQUEST['nid']?>",  
                $("#form_edit").serialize(), 
                function(data){  
                    if (data.success) {  
                     $("#tree_data").html("TEST");
}
               }  
           );  
           return false;
       }); 

but jquery not find #tree_data in this html.
???