SOURCE

var cookieUtil = {
  get: function(name) {
    var cookieName = encodeURIComponent(name) + '=',
        cookieStart = document.cookie.indexOf(cookieName),
        cookieValue = null;
    
    if(cookieStart > -1) {
      var cookieEnd = document.cookie.indexOf(';', cookieStart);
      if(cookieEnd == -1) {
        cookieEnd = document.cookie.length;
      }
      cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd));
    }
    
    return cookieValue);
  },
  set: function(name, value, expires, path, domain, secure) 	{
  	var cookieText = encodeURIComponent(name) + '=' + encodeURIComponent(value);
  	if(expires instanceOf Date) {
  		cookieText += '; expires=' + expires.toGMTString();
		}
		if(path) {
      cookieText += '; path=' + path;
    }
		if(domain) {
      cookieText += '; domain=' + domain;
    }
		if(secure) {
      cookieText += '; secure';
    }
		document.cookie = cookieText;
	},
  unset: function(name, path, domain, secure) {
    this.set(name, '', new Date(), path, domain, secure);
  }
}