Embedding gallery with HTML

I figured it out using the code:

<?php $gal = apply_filters(‘the_content’, ‘[slideshow id=x]’ );
echo $gal; ?>

Where x is the id of the slideshow. But now I need to change the transition/fade effect for this particular slideshow to be different from the other slideshows on my site.

Is this possible to have custom transition effects for each slideshow?

edit: also trying to use <center></center> around the code does not work. How do I center the slideshow as well?

Thanks so much for any help.