Issue with append() and variables

Issue with append() and variables

I'm a little new to JQuery and think I'm dealing with a fairly easy issue that I'm just overlooking.

Here is what I'm trying to do (in case someone has an overall better way to do it):

I have a single form that needs to act as multiple forms. Basically what I'm planning on doing is have a <select> box that the visitor can choose which form they need. When they select an option, it will add that section to the form. When the visitor submits the form, I don't want it to submit all of the different sections, just the one that they chose, so I figure that hiding with "display:none" is out. That is why I'm trying to append.

Here is what I have so far, then I'll explain one of the issues that I need help with...

JQuery
$(function() {
   
  $("#interest").change(function() {
   var kitchen = "<fieldset id='kitchen'><legend>Kitchen Renovation</legend><p>This is for the kitchen form.</p></fieldset>";
   var bathroom = "<fieldset id='bathroom'><legend>Bathroom Renovation</legend><p>This is for the bathroom form.</p></fieldset>";
   
   $('#addition').empty().append($(this).val());
  });

});


HTML Form
<form name="estimate" id="estimate" action="#">
  <fieldset>
      <legend>Personal</legend>
      Name:
      <input type="text" size="30" />
      <br />
      Email:
      <input type="text" size="30" />
  </fieldset>
  <fieldset>
      <legend>What's Your Interest</legend>
      <select id="interest">
        <option value="kitchen">Kitchen Renovation</option>
        <option value="bathroom">Bathroom Renovation</option>
      </select>
  </fieldset>
  <div id="addition"> </div>
</form>


It is kind of working. One issue is that "$(this).val()" is not pulling the string from the variable above it. It is actually adding either "kitchen" or "bathroom" to the HTML. I need it to pull the info that is in the variable's string.

I really hope that this makes some sense.