code: function() {
  			if (!this._aHistory) {
  				var aHistory = this._oStorage.get(this._sHistoryId);
  				if (typeof (aHistory) === "string") {
  					// in case it is a string, convert it to an array
  					aHistory = aHistory.split(",");
  				} else if (!aHistory) {
  					// or create a new one in case of non existence
  					aHistory = [];
  				} // else assume that there is the means for serializing JSON used, returning an array directly
  				//do a final check of the entries
  				this._aHistory = this._fCheckHistory(aHistory);
  			}
  			return this._aHistory;
  		}
docs: Initializes the history if not already done.
  
  @private