code: function(sValue) {
  			var aHistory = this._initHistory();
  			// ensure it is not contained twice -> remove
  			for (var i = 0; i < aHistory.length; i++) {
  				if (aHistory[i] === sValue) {
  					aHistory.splice(i,1);
  					break;
  				}
  			}
  			// and put it to the 'very top'
  			aHistory.unshift(sValue);
  			// but do not store more than specified
  			if (aHistory.length > this._iMaxHistory) {
  				aHistory.splice(this._iMaxHistory);
  			}
  
  			this._oStorage.put(this._sHistoryId, aHistory);
  		}
docs: Adds the given value to the history.
  
  @private