[eluser]Mike DeFelice[/eluser]
Sorry for the delayed response, you would need a way when you click on the list items that appear they add to the tag field. I think you would be able to do this in the actual list items with some additional JQuery.
Code:
<ul>
<li class="tagadd">Tag 1</li>
<li class="tagadd">Tag 2</li>
</ul>
Then in your Javascript add some JQuery such as (Didn't test it, I think it should work) then all you would need to do is add an id to your field with the tags (tagfield)
Code:
$(function() {
$('.tagadd').click(function()
{
$("#tagfield").append($(this).text());
return false;
});
});