Add Tag Button

I want to create a custom possibly META box or TinyMCE buttons to add tags (post tags – keywords) to my post when someone clicks a button. I know you can use:

<?php the_tags( ‘<p>Tags: ‘, ‘, ‘, ‘</p>’); ?>

To call the tags of a post, I was wondering if I could use something similar to define several different tags, and then define a function to add the tags to the post once clicked? Any ideas how I can accomplish this?