function getcookieval (offset) {
  var endstr = document.cookie.indexof(";", offset);
  if (endstr == -1) endstr = document.cookie.length; 
  return unescape(document.cookie.substring(offset, endstr));
}

function getcookie (name) { 
  var arg = name + "="; 
  var alen = arg.length; 
  var clen = document.cookie.length;
  var i = 0; 
  while (i < clen) { 
    var j = i + alen; 
    if (document.cookie.substring(i, j) == arg) 
        return getcookieval (j); 
    i = document.cookie.indexof(" ", i) + 1; 
    if (i == 0) break; 
  } 
  return null;
}

function setcookie (name, value) { 
  var argv = setcookie.arguments; 
  var argc = setcookie.arguments.length; 
  var expires = (argc > 2) ? argv[2] : null; 
  var path = (argc > 3) ? argv[3] : null; 
  var domain = (argc > 4) ? argv[4] : null; 
  var secure = (argc > 5) ? argv[5] : false;
  document.cookie = name + "=" + escape (value) + 
  ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 
  ((path == null) ? "" : ("; path=" + path)) + 
  ((domain == null) ? "" : ("; domain=" + domain)) + 
  ((secure == true) ? "; secure" : "");
}

function deletecookie (name) { 
  var exp = new date(); 
  exp.settime (exp.gettime() - 1); 
  var cval = getcookie (name); 
  document.cookie = name + "=" + cval + "; expires=" + exp.togmtstring();
}