平成30/ 2018-12-19 17:44
javascript style display='block' よりも、display=''
http://webcache.googleusercontent.com/search?q=cache:MsDUp3ITR-IJ:www.h-fj.com/blog/archives/2007/05/06-134912.php+javascript+display+none+block+table&cd=5&hl=ja&ct=clnk&gl=jp&source=www.google.co.jp
function toggle_row_b(id)
{
    var obj = document.getElementById(id);
    obj.style.display =
        (obj.style.display == 'none')
        ? '' : 'none';
    return false;
}