function createCookie(name, value, days)
{
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
    }
  else var expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name)
{
  var ca = document.cookie.split(';');
  var nameEQ = name + "=";
  for(var i=0; i < ca.length; i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1, c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
  return null;
}

function eraseCookie(name)
{
  createCookie(name, "", -1);
}

function showHide(id)
{
  submenu=document.getElementById('sub'+id).style;
  submenu.display=(submenu.display == 'block')?'none':'block';
  submenu.display == 'block'? createCookie('sub'+id,'block'):eraseCookie('sub'+id);
  document.getElementById('fol'+id).className=(submenu.display == 'block')?'minus':'plus';
}

function show(id)
{
  submenu=document.getElementById('sub'+id).style;
  submenu.display='block';
  createCookie('sub'+id,'block');
  document.getElementById('fol'+id).className='minus';
}

function displaySub(id)
{
  submenu=document.getElementById('sub'+id).style;
  submenu.display=(readCookie('sub'+id))?'block':'none';
  document.getElementById('fol'+id).className=(readCookie('sub'+id))?'minus':'plus';
}