function menuControl(clicked) {

  /* variable to handle the display state of sub menu's */
  var displayState;


  navRoot = document.getElementById('leftNav').getElementsByTagName('ul')[0];

  navLists = navRoot.getElementsByTagName("ul");

 
	

  for (i=0;i<navLists.length;i++) {

	if (navLists[i].className == "submenu") {
		navLists[i].style.display = "none";
		navLists[i].id = "";
	} 
  }


  li = clicked.parentNode;
  submenu = li.getElementsByTagName("ul")[0];

  submenu.style.display = 'block';


} // End function menuControl.