function TopicChange(num){
    document.getElementById('gomis_body').className  = "body_hide";
    document.getElementById('gomil_body').className  = "body_hide";
    document.getElementById('gomib_body').className  = "body_hide";
    document.getElementById(num + '_body').className  = "body_show";

    document.getElementById('gomis_tab').className  = "topic_tab tab_off";
    document.getElementById('gomil_tab').className  = "topic_tab tab_off";
    document.getElementById('gomib_tab').className  = "topic_tab tab_off";
    document.getElementById(num + '_tab').className  = "topic_tab tab_on";
}