If you want to create a Fancy Gallery with text links or with one thumbnail only there is only one way: You need to create a link for each image manually and add to each
<a> Tag the same "rel" attribute.
<a href="image1.jpg" rel="my-gallery">Click to start the Gallery</a><a href="image2.jpg" rel="my-gallery"></a><a href="image3.jpg" rel="my-gallery"></a><a href="image4.jpg" rel="my-gallery"></a>
So you would have one visible text link and if the user click it he can navigate through the four images.
If you want to have such a feature for galleries you need to modify the output of the WordPress embedded gallery shortcode. I included this feature in the Pro Version of Fancy Gallery where you can use templates for each gallery. :)