Tracking Form Submit...

In Firefox, what's the best way of tracking the form submit?
The following are two ways I tried, but they won't work if the form is
submitted through JavaScript.

Method 1: using the window.onsubmit event handler

Code: window.onsubmit=handleEvent;

Method 2: I am attachin event listeners to all the forms for the event
submit.

for(var i=0;i<forms.length;i++)
{
var form=forms[i];
form.addEventListener("submit",handleEvent,false);
}

It seems submit event is not generated if the form doesn't have a
submit button. Why so?

What's the best way through which what ever way the form is submitted,
I should be able to track it.