Determining nodeType of context-clicked element

Hello,
            I'm writing an extension which will do something with a word 
that is context-clicked on (unselected text).  I currently have the 
following code, but the nodeType returned when context-clicking on text is 
1, instead of 3.

Here's a snippet of the overlay.js file:
[code]
var ffextension = {
  onLoad: function() {

    this.initialized = true;
    document.getElementById("contentAreaContextMenu")
  .addEventListener("contextmenu", onMenuItemCommand, false);
  },

  onMenuItemCommand: function(e) {

   var node = e.rangeParent;
   var pos = e.rangeOffset;
   if (node.nodeType === 3 || node.nodeType === 4) {
  // code never gets here, nodeType is 1 even when
  // right-clicking on text or input box
  // the nodeName is xul:hbox
   }
  },

window.onload = onload;
[/code]

How can I get retrieve the context as a text node, if I am clicking on text?

Any help would be appreciated,
Jack