Checkbox Tree bug under IE6

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userPollTreePanel.on('beforeexpandnode', function(node, deep, anim) {
		if (node.attributes.isGroup == '1') {
			var isIE = !!window.ActiveXObject;   
 			var isIE6 = isIE && !window.XMLHttpRequest;
 			if(isIE6){
 				var logicChannelsSelected = userPollTreePanel.getChecked();
				var logicChannelRecordArr  = [];
				for (var i = 0; i < logicChannelsSelected.length; i++) {
					var id = logicChannelsSelected[i].id;
					logicChannelRecordArr.push(id);
				}
				for(var j=0;j