http://dhtmlx.com/docs/products/kb/index.php?s=normal&q=7304

Now i included it manualy, but same error. Here my code:

<link rel=“STYLESHEET” type=“text/css” href="…/script/treetool/dhtmlxtree.css">
<script src="…/script/treetool/dhtmlxcommon.js"></script>
<script src="…/script/treetool/dhtmlxtree.js"></script>
<script src="…/script/treetool/ext/dhtmlxtree_start.js"></script>
<script src="…/script/treetool/ext/dhtmlxtree_wz.js"></script>

[…]

var lastDelId;
user_tree=new dhtmlXTreeObject(“inhalt_treemenu”,“100%”,"",0);
user_tree.setImagePath("…/script/treetool/imgs/");user_tree.setDragBehavior(“complex”);
user_tree.enableDragAndDrop(1);
user_tree.setDragHandler(myDragHandler);user_tree.setOnDblClickHandler(onNodeSelect);
user_tree.attachEvent(“onOpenEnd”,function(){
window.setTimeout(function(){ // need to wait while open tread will be closed
user_tree.saveOpenStates();
},1);
});
user_tree.loadXML(“xml.php”,function(){ user_tree.loadOpenStates(); });

do i have zu configure some files to include dhtmlxtree_wz.js correctly?

While you are using
dhtmlxtree_wz.js
Correct file name is
dhtmlxtree_xw.js

If necessary - you can contact us directly at support@dhtlmx.com - we will provide a separate sample for functionality in question.

ok, this was an easy mistake shame on me
Now it works!

but…
in FF Error Console i get an new Error:  “tree is not defined”  source: (…)/dhtmlxtree_xw.js  line: 17

Thanks for your help!

It seems that you are using not latest codebase, such error was confirmed and fixed for one of earlier build.
Please try to use updated file ( sent by email ) instead of original one

now all is ok, thank you!