function containsDOM (container, containee)
{
	var isParent = false;
	do
	{
		if (isParent = (container == containee))
			break;
		
		containee = containee.parentNode;
	}
	while (containee != null);
	
	return isParent;
}

function checkMouseEnter (element, evt)
{
	if (element.contains && evt.fromElement)
	{
		return !element.contains(evt.fromElement);
	}
	else if (evt.relatedTarget)
	{
		return !containsDOM(element, evt.relatedTarget);
	}
}

function checkMouseLeave (element, evt)
{
	if (element.contains && evt.toElement)
	{
		return !element.contains(evt.toElement);
	}
	else if (evt.relatedTarget)
	{
		return !containsDOM(element, evt.relatedTarget);
	}
}