Add Event Listener in Javascript

Mozilla firefox Developer Center example and usage:

https://developer.mozilla.org/En/DOM/Element.addEventListener

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Another example for this:

// Cross-browser implementation of element.addEventListener()
// Usage: addListener(window, 'load', myFunction);

function addListener(element, type, expression, bubbling){
bubbling = bubbling false;
if(window.addEventListener) { // Standard
element.addEventListener(type, expression, bubbling);
return true;
} else if(window.attachEvent) { // IE
element.attachEvent('on' + type, expression);
return true;
}
else return false;
}

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