using external files in xml data islands

Hi:

I'm using xml data islands and works fine if I use a xml file in my own server.
But if I try to use a file that reside in other server don't work.

Security Problem??

No error message is showed.

<!---------------the code ------------->

<XML ID='oMetaData' ondatasetcomplete="show()" src='http://www.xml101.com/examples/note.xml'></XML>-

<script language='javascript'>

function show(){
var oNode = oMetaData.XMLDocument.selectSingleNode("note/to");
alert(oNode.text);
}

</script>

<!---------------------------------------->


Thanks in advance.