function hideAllSubMenus() {
  $('menu').descendants().each(function(top) {
	// if-abfragen geschachtelt wegen performance vom top.down
    if (top.className == 'subMenu' && top.tagName == 'UL' && Element.visible(top)) {
	  if (typeof(top.down('a.active')) == "undefined") {
		top.hide();
	  }
    }
    if (top.className == 'subMenuImg' && top.tagName == 'IMG') {
      top.src = 'lp-design/images/menuToggle.gif';
    }
  });
}

function toggleSubMenu(control) {
  var elem = $(control);
  var imgElem = $(control+'Img');
  if (elem.style.display == 'none') {
    hideAllSubMenus();
    elem.style.display = 'block';
    imgElem.src = 'lp-design/images/menuUntoggle.gif'
  } else {
    elem.style.display = 'none';
    imgElem.src = 'lp-design/images/menuToggle.gif'
  }
}