function show_news(id){
    // ������
    document.getElementById('news_and_event1').style.display = "none";
    document.getElementById('bt_all').className = 'bt_all';
    document.getElementById('news_and_event2').style.display = "none";
    document.getElementById('bt_news_topics').className = 'bt_news_topics';
    document.getElementById('news_and_event3').style.display = "none";
    document.getElementById('bt_event_info').className = 'bt_event_info';
    
    if(id == 1){
        document.getElementById('news_and_event1').style.display = "block";
        document.getElementById('bt_all').className = 'bt_all2';
    }
    
    if(id == 2){
        document.getElementById('news_and_event2').style.display = "block";
        document.getElementById('bt_news_topics').className = 'bt_news_topics2';
    }
    if(id == 3){
        document.getElementById('news_and_event3').style.display = "block";
        document.getElementById('bt_event_info').className = 'bt_event_info2';
    }
}