function visibility(id){
	if($(id).style.visibility =='visible'){
		$(id).style.visibility ='hidden';
		MM_effectAppearFade($(id), 1, 100, 0, false);
	}else{
		MM_effectAppearFade($(id), 1000, 0, 100, false);
		$(id).style.visibility ='visible';	
	}
}