Get A List Of Events Attached With An Object?

I am using following JavaScript code to add click event on anchor tags with attribute rel="gcode"

Now I need a script to highlight all anchor tags which have an click event attached with them.

Is it possible using JavaScript to get a list of events attached with an object? Also I will need to check the code used in every event. (It is something like an Quality Assurance or Debugging code.)

Code JavaScript:
function gLinks() {
if (!document.getElementsByTagName) return;
var anchors = document.getElementsByTagName("a");
for (var i=0; i<anchors.length; i++) {

[Code].....