function compatibleAddEventListener(listener, eventName, functionToTrigger)
{
	if(typeof window.addEventListener != 'undefined')
	{
		//.. gecko, safari, konqueror and standard
		//.. opera 7
		if(eventName.substring(0,2) == 'on')
			eventName = eventName.substring(2,eventName.length);
				
		listener.addEventListener(eventName, functionToTrigger, false);
	}
	else if(typeof window.attachEvent != 'undefined')
	{
		//.. win/ie
		if(eventName.substring(0,2) != 'on')
			eventName = 'on' + eventName;

		listener.attachEvent(eventName, functionToTrigger);
	}

}