function creditsPosition(){
	boxLinkPosition = $('nav_credits');
	boxPosition = $('nav_credits');
	id_credits = $('link_credits');
	if (boxLinkPosition != null && boxPosition != null && id_credits != null){
		linkPosition = getAnchorPosition('link_credits');
		boxPosition.style.top = linkPosition.y - 263 + 'px';
		boxPosition.style.left = linkPosition.x - 181 + 'px';
	}
}
function showCredits(){
	boxLinkPosition = $('link_credits');
	boxPosition = $('nav_credits');
	if (boxLinkPosition != null && boxPosition != null){
		Effect.Appear('nav_credits', { duration: 1.0 });
	}
}
function hideCredits(){
	Effect.Fade('nav_credits', { duration: 1.0 });
}