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

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

            var data = getFromCache( 'some_key' );

            if ( data ) {
                draw( drawFunc, data );
                // Save in stack
            } else {
                $.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>