var naviClass = "thide";
function collapseAll() 
{
  var allSections = document.getElementsByTagName("UL");
  for (i = 0; i < allSections.length; i++) 
  {
    if (allSections[i].className == naviClass) 
    { 
      allSections[i].style.display = "none"; 
    }
  }
}
function expand(name) 
{
  collapseAll();
  var newStyle = "";
  if (document.getElementById(name).style.display != "block") 
  { 
    newStyle = "block"; 
  } 			
  else 
  { 
    newStyle = "none"; 
  }
  document.getElementById(name).style.display = newStyle;
}