Wordpress Image Code Box

I am trying to put in an image code box to make it easy for people to grab images for their sites. I am trying to make it just like the one below the image on http://icanhascheezburger.com/

I have most of it but i can not find the php snippet to pull the src/image from the individual post and put it in the box

<textarea onClick=”this.select();” style=”width:350px;height:100px;font-family:tahoma;font-size:12px;” readonly><a href=”<?php the_permalink(); ?>” title=”<?php the_title(); ?>“><img <?php echo $src ?>" alt="<?php the_title(); ?>" /></a></textarea>

PHP:

The

<?php echo $src ?>

PHP:

is the only problem and i can not for the life of me find the proper snippet of code to pull from individual posts.

 

The code box is pretty simple but i cannot find the right peice of code, and i really need it for one of my sites so i can finish it up