undefined error and loaded clip disappear clicking first level menu

[carloz]

Hi, I am loading external swf in a scrollpanel nested inside a movieclip. When I am clicking on any first-level button of the menu the swf previously loaded disappear leaving the scrollpanel blank and I get this flash error:

Error opening URL "file:///C|/Users/carlo/Desktop/sito%20napoliest/definitivi/undefined"

If I click a sublevel button than the next swf is correctly loaded but I need the other to stay.

Here the xml

<item label="Chi siamo" >
<subitem label="Comune di Napoli" clip="scrollbar3.swf" />

</item>

and here the AS

menu_mc.onItemClick= function(node:XMLNode, level:Number){
_root.centro.content1.loadMovie(node.attributes.cl ip);
}

so if I click to the "Chi siamo" button, the submenu opens but any swf previously loaded disappear while it should be there. Please help!

[Adrian]

Please do not double post. I've answered in your other post.