var subnaviActiveId=-1;
function showsubnavi(id){
	var subnavi = getObj("subnavi"+id);
	if( subnaviActiveId!=-1 ){
		var activeSubnavi = getObj("subnavi"+subnaviActiveId);
		activeSubnavi.style.display = 'none';
	};
	subnavi.style.display = 'block';
	subnaviActiveId = id;
	return false;
};