function go_ofmul() {
    console.log('ofmul');
    // browser seem to cache selections on checkboxes
    reset_signoff_checkboxes();
    check_that_reports_remain();
    // choose repcode div
    var chuko_ele = document.getElementById('chuko');
    if(chuko_ele == null) {
        // console.log('multi not found');
        return false;
    }
    if(chuko_ele.style.display == 'none') {
        // console.log('set multi');
        chuko_ele.style.display = 'block';
    }
    var single_ele = document.getElementById('single');
    if(single_ele == null) {
        // console.log('single not found');
        return false;
    }
    single_ele.style.display = 'none';
    //console.log('done');
    return true;
}


function check_that_reports_remain() {
    var checkboxes = document.querySelectorAll('input[type="checkbox"]:checked');
    var signoff_button = document.getElementById('signoff_button');
    var instruct_to_check = document.getElementById('instruct_to_check');
    var cancel_button = document.getElementById('instruct_to_check');
    var plural_s = document.getElementById('plural_s');
    // console.log(signoff_button.style.visibility)
    if(checkboxes.length == 0) {
        // signoff_button.disabled = true;
        // signoff_button.style.visibility = 'hidden';
        // console.log('none');
        // cancel_fs = getComputedStyle(cancel_button)
        // var compStyles = window.getComputedStyle(cancel_button);
        // var ff = compStyles.getPropertyValue('font-size');
        signoff_button.style.display = 'none';
        instruct_to_check.style.display = 'table-cell';
        instruct_to_check.style.fontSize = ff;
        return true;
    }
    if(checkboxes.length == 1) {
        instruct_to_check.style.display = 'none';
        signoff_button.style.display = 'initial';
        plural_s.style.visibility = 'hidden';
    }
    if(checkboxes.length > 1) {
        instruct_to_check.style.display = 'none';
        // signoff_button.style.display = 'initial';
        plural_s.style.visibility = '';
    }
    // signoff_button.disabled = false;
    signoff_button.style.visibility = '';
    return true;
}

function reset_signoff_checkbox(checkbox) {
    if(checkbox.id == 'target_checkbox') {
        // console.log('first');
        checkbox.checked = true;
    }
    else {
        // console.log('second');
        checkbox.checked = false;
    }
}

function reset_signoff_checkboxes() {
    var signoffs = document.getElementsByClassName('signoff_checkbox');
    // console.log(signoffs);
    Array.from(signoffs).forEach(reset_signoff_checkbox);
}