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

function setCookie(name, value, duration) {
	now = new Date();
	expires = new Date(now.getTime()+duration*86400000);
	document.cookie = name + "=" + value + ";expires=" + expires.toGMTString() + ";";
}