Script to set, remove and get a cookie.

cookie.js

var cookie = function() {
    this.set = function(key, value, expire, path) {
    	if(!key && !value) return false;
      expire = ( expire instanceof Date ) ? expire.toGMTString() : 'Fri, 31 Dec 9999 23:59:59 GMT';
      key = encodeURIComponent(key);
      value = encodeURIComponent(value);
      var cookie = key + '=' + value + '; ' + 'expires=' + expire + ';';
      if(path) cookie += ' path=' + path + ';';
      document.cookie = cookie;
      return true;
    };

    this.remove = function(key, path) {
    	if(key) return false;
      key = encodeURIComponent(key);
      var expiredCookie = key + '=; expires=Thu, 01 Jan 1970 00:00:00 GMT;';
      if(path) expiredCookie += ' path=' + path;
    	document.cookie = expiredCookie;
      return true;
    };

    this.get = function(key) {
    	if(!key) return false;
      var regex = '(?:(?:^|.*;\\s*)' + encodeURIComponent(key) + '\\s*\\=\\s*([^;]*).*$)|^.*$';
      var value = document.cookie.replace(new RegExp(regex), '$1');
      value = decodeURIComponent(value);
      return value.length > 0 ? value : false;
    };
  }