function tm(menuID, buttonID) {
if (!document.getElementById) return;

var m = document.getElementById(menuID).style;
m.display = (m.display == 'block') ? 'none' : 'block';

var b = document.getElementById(buttonID);
b.innerHTML = (b.innerHTML == 'Gerelateerd [+]') ? 'Gerelateerd [x]' : 'Gerelateerd [+]';
}