$j(document).ready(function(){
  $j('#apartment').change(function(){
    if( $j(this).val() != 11 ) { 
      $j('#adults option[value="3"]').get(0).disabled = true;
      $j('#adults option[value="4"]').get(0).disabled = true;
    } else {
	$j('#adults option[value="3"]').get(0).disabled = false;
	$j('#adults option[value="4"]').get(0).disabled = false;
    }
  });
  
  $j('#recalculate').click(function(){
    $j.getJSON('index.php',
	    {'calculate': 'calculate', 'arrival': $j('#arrivaldate').val(), 'departure': $j('#depdate').val(), 'type': $j('#apartment').val(), 'adults': $j('#adults').val(), 'children': $j('#children').val() },
	    function(data){
	      if( data['success'] == true ) {
		$j('#amount').html( data['amount'] + $('#currency').text() );
		$j('#amount_inp').val( data['amount'] );
		$j('input[name="makeReservation"]').get(0).disabled = false;
	      }
	    }
    )
    return false;
  })

})