<a class="ajax" rel="showGallery" href="photo/gallery/1">Gallery 1</a></li>
<a class="ajax" rel="showGallery" href="photo/gallery/2">Gallery 2</a></li>

<script>
    $( function() {
        $( 'a.ajax' ).live( 'click', function() {
            var href = $( this ).attr( 'href' );
            var drawFunc = $( this ).attr( 'rel' );

            $.get(
                href,
                {},
                function( data ) {
                    draw( drawFunc, data );
                    // Save in stack
                },
                'json'
            );

            return false;
        });
    });

    function draw( drawFunc, data )
    {
        // Spec effects
        drawFunc( data );
        // Spec effects
    }

    function showGallery( data )
    {
        // Draw gallery
    }
</script>