function Menu_expand(id){

  if (document.all)
    {if(document.all[id].style.display == 'none')
      {document.all[id].style.display = '';} 
     else 
      {document.all[id].style.display = 'none';}
     return false;} 
  else 
    if (document.getElementById)
      {if(document.getElementById(id).style.display == 'none')
         {document.getElementById(id).style.display = '';} 
        else 
         {document.getElementById(id).style.display = 'none';}
      return false;}
    else
      {document.location.href = id + '.htm';}}