code: function(inName, inValue) {
  		this.attributes[inName] = inValue;
  		if (this.hasNode()) {
  			this.attributeToNode(inName, inValue);
  		}
  		this.invalidateTags();
  	}
docs: Sets the value of an attribute on this object. Pass null _inValue_ to remove an attribute.
  
  set the tabIndex attribute for this DomNode
  this.setAttribute("tabIndex", 3);
  ...
  remove the index attribute
  this.setAttribute("index", null);