I was completely confused by the error handling for JS. I've managed to keep things simple for the time being (i need more time!!!) and the addEvent function is an example of this.

Instead of playing with the addEventListener/attachEvent functionality, I decided to do something a little simpler - re-write the specific event handler code.

E.g. (excuse the poor pseudo code)
function addEvent( oElement, strEventHandler, strActions ){
is oElement.strEventHandler defined yet?
Yes: append strActions to the end of the ciurrent function declaration
No: set the curent function decleration to strActions
}

so
addEvent( form1.btn_go, "onclick", "alert('the go button was clicked');")
addEvent( form1.btn_go, "onclick", "window.location.href='www.zging.com';");

is the equivelant of:

form1.btn_go.onclick= function (){
alert('the go button was clicked');
window.location.href='www.zging.com';
}

This is dead simple and it works... but I haven't investigated any side effects, or reasons for it being a bad method.

Any opinions?

Personaly I can't see what is wrong with addEvent, I was using without problem too, but I need to make more tests to see.

I think the problem is mainly caused by IE implementation of addEvent() which isnt compatible with the W3C addEventListener.