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;
	}
}

// usage examples
// addListener(this, "load", function() { myFunction(); });
// addListener(window, "load", function() { myFunction(); });