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2 Trees + Connector_PHP - prevent drag on connector tree?

I have an app where I drag a list of xml_generated documents from one container to a second container-- a connector_php tree of categories. I would like documents to be dragged anywhere,in any container, but have the categories be fixed (no drag, but category can be dropped on).

I've added a db field "nodrag" = true, but don't know how to render this in the connector so it displays on the site as UserData.
Then I would use a custom function to prevent drag of these UserData items.

Here's the general idea:
tree.attachEvent("onBeforeDrag",function(){
var testdnd = tree.getUserData(id,"nodrag").value;
if (testdnd = "true") {return false;} else {return true;}
});

Any ideas on how to solve?



// the connector_php code//

    function no_dragging_categories($data){
        if ($data->get_value("nodrag") = "true")
            add the tag "<userdata name='nodrag'>true</userdata>";
            }
    $tree = new TreeConnector($res);
    $tree->event->attach("beforeRender","no_dragging_categories");
    $tree->render_table("CATEGORYLIST","taskId","taskName","","parentId");


// the html code//
...

//--CATEGORIES TREE - RHS --//
        tree=new dhtmlXTreeObject("treeboxbox_tree","100%","100%",0);
        tree.setImagePath("../dhtmlxSuite/dhtmlxTree/codebase/imgs/");
        tree.enableDragAndDrop(true,false);
        tree.attachEvent("onDblClick",function(id){document.location.href=tree.getUserData(id,"url");return true;});
        tree.loadXML("get-categories.php");
        //need to make this trees elements not draggable - use userdata

//--DOCUMENTS TREE - LHS --//
        tree2=new dhtmlXTreeObject("treeboxbox_tree2","100%","100%",0);
        tree2.setImagePath("../dhtmlxSuite/dhtmlxTree/codebase/imgs/");
        tree2.enableDragAndDrop(true);
        tree2.makeAllDraggable();
        tree2.attachEvent("onDblClick",function(id){document.location.href=tree2.getUserData(id,"url");return true;});
        tree2.loadXML("get-docs.php");

//--PREVENT DRAGS AND DROPS ONTO DOCUMENTS TREE --//
        function no_drag_to_docs(id_drag, id_landing) {return false;}
        tree2.setOnDragIn(no_drag_to_docs);

//--PREVENT MOVING CATEGORIES, allow documents dnd here only --//
        tree.attachEvent("onBeforeDrag",function(id){
         var testdnd = tree.getUserData(id,"nodrag").value;
         doLog(testdnd);
         if (testdnd = "true") {return false;} else {return true;}
        });