1) EventType: A string representing the event to bind, without the "on" prefix. For example, "click", "mousedown" etc.
2) listener: The function or method to associate with the event.
3) useCapture: Boolean indicating whether to bind the event as it is propagating towards the target node, (event Capture), or as the event bubbles upwards from the target (event bubble). Set to true or false, respectively.

The advantage of using the DOM to bind an event is that you can assign multiple functions to a node for the same event (ie: window.onload) without running into event handler conflicts.

Example(s):

function statusreport(){
alert("document has loaded")
}

if (window.addEventListener)
window.addEventListener("load", statusreport, false) //invoke function
window.onload=statusreport() //function invoked again, since no event handler conflicts

Example(s):

if (window.attachEvent)
window.attachEvent("onload", statusreport) //invoke function 

Example(s):

if (window.detachEvent)
window.detachEvent("onload", statusreport) //invoke function 

Example(s):

<div id="test" onclick="alert('hi')">Sample DIV.</div>

<script type="text/javascript">
//Generate an artificial click event on "test". Fires alert("hi")
var clickevent=document.createEvent("MouseEvents")
clickevent.initEvent("click", true, true)
document.getElementById("test").dispatchEvent(myevent)

</script> 

<script type="text/javascript">
var mydiv=document.getElementById("test")
var mydivstyle=window.getComputedStyle(mydiv, "")
var divbgcolor=mydivstyle.getPropertyValue("background-color") //contains "yellow"
</script>

For more info, see: Getting global and external style sheet values in DHTML
 

window.releaseEvents(Event.KEYPRESS) //single event
window.releaseEvents(Event.KEYPRESS | Event.KEYDOWN | Event.KEYUP) //multiple events

1) EventType: A string representing the event to unbind, without the "on" prefix. For example, "click", "mousedown" etc.
2) listener: The function or method to associate with the event.
3) useCapture: Boolean indicating whether to unbind the event as it is propagating towards the target node, (event Capture), or as the event bubbles upwards from the target (event bubble). Set to true or false, respectively.

 NS6/Firefox method.