function checkNoticeChoice(myThis){
    if(myThis.id == 'cn0'){
        document.getElementById('cn1').checked = false;
        document.getElementById('cn2').checked = false;
        document.getElementById('cn3').checked = false;
        document.getElementById('cn4').checked = false;
        document.getElementById('cn5').checked = false;
        document.getElementById('cn6').checked = false;
    }
    else if(document.getElementById('cn0').checked == true) document.getElementById('cn0').checked = false;
}