How to add value to textarea when checkbox is checked

I am using the following function that I just found here on SO that does the work with regards to my question only one issue is that, I have a long list of selection and when a user check more than 3-4 checkboxes some of the text or value that is added on the textarea are no longer visible. Is there any way so that everytime a box is check the text that is being added to the text area is always visible? Any help is greatly appreciated.

-thanks ahead!

<input type="text" value="" class="textfield" id="video0_tags" name="video0_tags">
<div class="taglist">
<label><input type="checkbox" value="2D Animation">2D Animation</label>
<label><input type="checkbox" value="3D Animation">3D Animation</label>
<label><input type="checkbox" value="Animatronics">Animatronics</label>
<label><input type="checkbox" value="Architectural">Architectural</label>
<label><input type="checkbox" value="Cartoon">Cartoon</label>
<label><input type="checkbox" value="Cell Animation">Cell Animation</label>
<label><input type="checkbox" value="Character Animation">Character Animation</label><label><input type="checkbox" value="Cut & Paste">Cut & Paste</label>
<label><input type="checkbox" value="Doodle">Doodle</label>
&l开发者_JAVA技巧t;label><input type="checkbox" value="HDR">HDR</label>
<label><input type="checkbox" value="High Speed">High Speed</label>
<label><input type="checkbox" value="Illustration">Illustration</label>
<label><input type="checkbox" value="Live Action">Live Action</label>
<label><input type="checkbox" value="Macro">Macro</label>
<label><input type="checkbox" value="Motion Design">Motion Design</label>
<label><input type="checkbox" value="Motion Graphics">Motion Graphics</label>
<label><input type="checkbox" value="Moving Installation">Moving Installation</label>
</div>


function updateTextArea() {     
   var allVals = [];
   $('.taglist :checked').each(function() {
      allVals.push($(this).val());
   });
   $('#video0_tags').val(allVals)
   }
   $(function() {
      $('#video0_tags input').click(updateTextArea);
      updateTextArea();
});

first, you will need to have a textarea element, so change the input tag with the textarea. Then on updateTextArea function, you can set the rows attribute on it so that all the text within it is visible. see http://jsfiddle.net/7b5fk/1/

First, you'll want to change video0_tags to a textarea. Next, you'll want to attach the .click() event to each checkbox so that every selection updates the textarea accordingly.

<textarea id="video0_tags"></textarea>

$(document).ready(function(){
    $(".taglist input").click(function(){
         $("#video0_tags").text('');
         $(".taglist :checked").each(function(){
              $("#video0_tags").append( $(this).val() + "\n");
         });
    });
});

Change the text input to a textarea and it will automatically add a scrollbar as it needs it.