function tMMi(itemID) {	// toggle menu item
	var objChildrenBlock = document.getElementById('mmiB'+itemID);
	if (objChildrenBlock != null) {
		if (objChildrenBlock.style.display == 'block') objChildrenBlock.style.display = 'none';
		 else objChildrenBlock.style.display = 'block';
	}
	return false;
}