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NextGen Smooth Gallery:Showing a gallery based on custom field ID

I have a custom field in my code called 'gallery' which holds the album ID from NextGen Gallery.

What I would like to do is parse that through to NextGen Smooth Gallery so it'll display the gallery alongside the post.

I have the following at the top:

<?php $gallery = get_post_meta($post->ID, 'gallery', true); ?>

And I've been trying to call it using:

<?php echo do_shortcode("[smooth=id:$gallery;]"); ?>

But all it does is show [smooth=id$3]. (3 being the ID)

What am I doing wrong?

Just uploaded the source code to http://pastebin.com/m59df2a28 and you can view it at http://wordpress.geek.nz/logan/test/