function toggleVisible(section)
{
    items = Array('d1', 'd2', 'd3', 'd4', 'd5', 'd7', 'd8', 'd9');
    for (var node in items)
    {
	var be = document.getElementById(items[node]);
	if (items[node] == section) {
	    be.style.display = 'block';
	} else {
	    be.style.display = 'none';
	}
    }
}