function checkCookies()
{ if(user = getCookie("username"))
  { document.write('<a href="#"><b>'+user+'</b></a> &nbsp;<a href="#">Change settings</a> &nbsp;<a href="#">Logout</a>');
  }
  else
    document.write('<a href="#">Login</a> &nbsp;<a href="#">Register</a>');
}

function setCookie(name, value, expires, path, domain, secure)
{ document.cookie= name + "=" + escape(value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}

/* Getcookie(): Get the value of the specified cookie: return null if cookie does not exist.
 */
function getCookie(name)
{ var dc = "; " + document.cookie + ";";
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1)
    return null;
  else
    begin += 2;
  var end = dc.indexOf(";", begin);
  return unescape(dc.substring(begin + prefix.length, end));
}

function deleteCookie(name, path, domain)
{ if (getCookie(name))
  { document.cookie = name + "=" +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}