rem: return this.selectedNode ? (this.selectedNode.nodeType == Node.ELEMENT_NODE) : false; 
add: return this.selectedNode ? (this.selectedNode.nodeType == nsIDOMNode.ELEMENT_NODE) : false; 
context:   cmdBlinkIsValid: function()  {    return this.selectedNode ? (this.selectedNode.nodeType == Node.ELEMENT_NODE) : false;  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/1bdedd18e398f941e1efe6c0448264ea16e357a1/dom.js/buggy/extensions/inspector/resources/content/viewers/dom/dom.js