Bug Load Page "setUrl" in IE6 - Ext JS

When I call a page that contains other code Ext, for example: Grid, BorderLayout, ... it's dosn't work in IE6, but it's does on FF2.

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main page:
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var rc = layout.getRegion('center');
var cp = new Ext.ContentPanel(winName, {title: title, loadOnce :true, id:winName, autoCreate:true, closable: true});
cp.setUrl('test.jsp?p=1',null,true);
rc.add(cp);
=======================================================

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test.jsp page:
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<script>
var GridView = function(){
...........................
Ext.onReady(GridView.init,GridView,true);
</script>
<body>
..................
</body>
=======================================================

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