// name = string equal to the name of the instance of the object
// defaultExpiration = number of units to make the default expiration date for the cookie
// expirationUnits = 'seconds' | 'minutes' | 'hours' | 'days' | 'months' | 'years' (default is 'days')
// defaultDomain = string, default domain for cookies; default is current domain minus the server name
// defaultPath = string, default path for cookies; default is '/'
function Cookiemanager(name,defaultExpiration,expirationUnits,defaultDomain,defaultPath) {
  // remember our name
  this.name = name;
  // get the default expiration
  this.defaultExpiration = this.getExpiration(defaultExpiration,expirationUnits);
  // set the default domain to defaultDomain if supplied; if not, set it to document.domain
  // if document.domain is numeric, otherwise strip off the server name and use the remainder
  this.defaultDomain = (defaultDomain)?defaultDomain:(document.domain.search(/[a-zA-Z]/) == -1)?document.domain:document.domain.substring(document.domain.indexOf('.') + 1,document.domain.length);
  // set the default path
  this.defaultPath = (defaultPath)?defaultPath:'/';
  // initialize an object to hold all the document's cookies
  this.cookies = new Object();
  // initialize an object to hold expiration dates for the doucment's cookies
  this.expiration = new Object();
  // initialize an object to hold domains for the doucment's cookies
  this.domain = new Object();
  // initialize an object to hold paths for the doucment's cookies
  this.path = new Object();
  // set an onlunload function to write the cookies
  window.onunload = new Function (this.name+'.setDocumentCookies();');
  // get the document's cookies
  this.getDocumentCookies();
}



// gets an expiration date for a cookie as a GMT string
// expiration = integer expressing time in units (default is 7 days)
// units = 'miliseconds' | 'seconds' | 'minutes' | 'hours' | 'days' | 'months' | 'years' (default is 'days')
Cookiemanager.prototype.getExpiration = function(expiration,units) {
  // set default expiration time if it wasn't supplied
  expiration = (expiration)?expiration:7;
  // supply default units if units weren't supplied
  units = (units)?units:'days';
  // new date object we'll use to get the expiration time
  var date = new Date();
  // set expiration time according to units supplied
  switch(units) {
    case 'years':
      date.setFullYear(date.getFullYear() + expiration);
      break;
    case 'months':
      date.setMonth(date.getMonth() + expiration);
      break;
    case 'days':
      date.setTime(date.getTime()+(expiration*24*60*60*1000));
      break;
    case 'hours':
      date.setTime(date.getTime()+(expiration*60*60*1000));
      break;
    case 'minutes':
      date.setTime(date.getTime()+(expiration*60*1000));
      break;
    case 'seconds':
      date.setTime(date.getTime()+(expiration*1000));
      break;
    default:
      date.setTime(date.getTime()+expiration);
      break;
    }
  // return expiration as GMT string
  return date.toGMTString();
}



// gets all document cookies and populates the .cookies property with them
Cookiemanager.prototype.getDocumentCookies = function() {
  var cookie,pair;
  // read the document's cookies into an array
  var cookies = document.cookie.split(';');
  // walk through each array element and extract the name and value into the cookies property
  var len = cookies.length;
  for(var i=0;i < len;i++) {
    cookie = cookies[i];
    // strip leading whitespace
    while (cookie.charAt(0)==' ') cookie = cookie.substring(1,cookie.length);
    // split name/value pair into an array
    pair = cookie.split('=');
    // use the cookie name as the property name and value as the value
    this.cookies[pair[0]] = pair[1];
    }
}



// sets all document cookies
Cookiemanager.prototype.setDocumentCookies = function() {
  var expires = '';
  var cookies = '';
  var domain = '';
  var path = '';
  for(var name in this.cookies) {
    if(name != "undefined") {
       // see if there's a custom expiration for this cookie; if not use default
       expires = (this.expiration[name])?this.expiration[name]:this.defaultExpiration;
       // see if there's a custom path for this cookie; if not use default
       path = (this.path[name])?this.path[name]:this.defaultPath;
       // see if there's a custom domain for this cookie; if not use default
       domain = (this.domain[name])?this.domain[name]:this.defaultDomain;
       // add to cookie string
       cookies = name + '=' + this.cookies[name] + '; expires=' + expires + '; path=' + path + '; domain=' + domain;
       document.cookie = cookies;
    }
  }
  return true;
}



// gets cookie value
// cookieName = string, cookie name
Cookiemanager.prototype.getCookie = function(cookieName) {
  var cookie = this.cookies[cookieName]
  return (cookie)?cookie:false;
}



// stores cookie value, expiration, domain and path
// cookieName = string, cookie name
// cookieValue = string, cookie value
// expiration = number of units in which the cookie should expire
// expirationUnits = 'miliseconds' | 'seconds' | 'minutes' | 'hours' | 'days' | 'months' | 'years' (default is 'days')
// domain = string, domain for cookie
// path = string, path for cookie
Cookiemanager.prototype.setCookie = function(cookieName,cookieValue,expiration,expirationUnits,domain,path) {
  this.cookies[cookieName] = cookieValue;
  // set the expiration if it was supplied
  if (expiration) this.expiration[cookieName] = this.getExpiration(expiration,expirationUnits);
  // set path if it was supplied
  if (domain) this.domain[cookieName] = domain;
  if (path) this.path[cookieName] = path;
  return true;
  }


var cookieManager = new Cookiemanager('cookieManager',1,'years','.bigge-energie.de');