if (Mconsole != null) {
  var node = Mconsole.graph.getNode(<%= @mapping.topic_id %>);
  node.setData('alpha', 0, 'end');  
  node.eachAdjacency(function(adj) {  
	adj.setData('alpha', 0, 'end');  
  });  
  Mconsole.fx.animate({  
	modes: ['node-property:alpha',  
			'edge-property:alpha'],  
	duration: 1000  
  });
  Mconsole.graph.removeNode(<%= @mapping.topic_id %>);
  Mconsole.labels.disposeLabel(<%= @mapping.topic_id %>);
}