How to update HTML element with jQuery and Galleria

Question

I am using Galleria for a slideshow. I want to place a small, 'Larger' link beside the stage.

I have this code for the 'Larger' button:

this.fullres = this.create('div', 'fullres');
this.get('fullres').innerHTML = '<a href="#">Larger</a>';
this.appendChild('fullres', this.fullres);

I have this code that assigns every <img>'s rel= tag to the full sized image URL from the page's custom field:

<img ... rel="<?=$attachments[$i]['fullres']?>" />

With JQuery, I am hoping to pull the active image's rel= tag value and append the .fullres href tag. This is the code I have so far, but it doesn't work:

var title = $(.images).attr('rel'); // pulls the fullres url from the rel tag
$('.galleria-fullres').attr('href', ); //append the galleria fullres href with the rel info