Cross Browser Add and Remove Event Listeners idea / demo

gistfile1.txt

var addEvent, removeEvent;
if ( window.addEventListener ) {
  addEvent = function(obj, type, fn ) {
    obj.addEventListener(type, fn, false );
  }
  removeEvent = function(obj, type, fn ) {
  obj.removeEventListener(type, fn, false );
  }
} else if (document.attachEvent) {
  addEvent = function(obj, type, fn ) {
    var eProp = type + fn;
    obj['e'+eProp] = fn;
    obj[eProp] = function(){obj['e'+eProp]( window.event );}
    obj.attachEvent( 'on'+type, obj[eProp] );
  }
  removeEvent = function(obj, type, fn ) {
    var eProp = type + fn;
    obj.detachEvent( 'on'+type, obj[eProp] );
    obj[eProp] = null;
    obj["e"+eProp] = null;
  }
}

This code owes a lot to John Resig, 
example of the way you would write your call to actually use it ...

var lnk = document.getElementById('ex');
addEvent(lnk, 'click', function(event) {
  alert(this.nodeName);
  alert(event);
});