Append select value to textarea

Append select value to textarea

Hi i need to append the value of a select option to a textarea. Using the code below i have managed to do this. But when i keep changing the selection option it keeps adding the values in the textarea - is there anyway to clear the last selected upon selecting a new one?

  1.     $('select.SelectTemplate').change(function() {
  2.         var currentVal = $('textarea').val();
  3.         $('textarea.AddMessage').val(currentVal + $(this).val()); 
  4.     });

Many thanks for your help and patience.