code: function(inst) {
  		var altFormat, date, dateStr,
  			altField = this._get(inst, "altField");
  
  		if (altField) { // update alternate field too
  			altFormat = this._get(inst, "altFormat") || this._get(inst, "dateFormat");
  			date = this._getDate(inst);
  			dateStr = this.formatDate(altFormat, date, this._getFormatConfig(inst));
  			$(altField).each(function() { $(this).val(dateStr); });
  		}
  	}
docs: /* Update any alternate field to synchronise with the main field.