function switchDetailLayer(id,flag){
	
	closeAll();
	
	var target = document.getElementById('detail_'+id);
	if(flag == 0) target.style.visibility = 'hidden';
	else          target.style.visibility = 'visible';		
	
}

function closeAll(){
	
	for( i = 1; i < 26; i++){
		var target = document.getElementById('detail_'+i);
		if(target!=null){
			target.style.visibility = 'hidden';			
		}
	}	
}