Use 'Ctrl' key to select a multiple nodes Use 'Shift' key to select range of nodes
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<script type="text/javascript">
function onNodeSelect(sender, args) {
  var logger = $get("lstSelectedNodes");
  if (logger == null) {
      return;
  }
  logger.innerHTML = "";
  //check whether ctrl or shift is pressed
  if (args.isMultipleSelect) {
      //get all the selected nodes
      for (var i = 0; i < sender.selectedNodes.length; i++) {
          logger.innerHTML += sender.getNodeText(sender.selectedNodes[i]) + '<br/>';
      }
  }
  logger.innerHTML += sender.getNodeText(args.node);
}
</script>