select jquery

select jquery

this script works in a select, how can remove the value append bellow? i had tried else but not working.

and another thing, if a click in another select and click  in report a problem, appear again the input and button, how can put this for appear only one time?

thanks.

<script>
    $("select").change(function () {
      if( this.value == 'report a problem' )
        {
          $('div').append("<input type='text'/>","<button>save</button>");
        }  
    });      
</script>