condition based dynamic sidebar

Ok I’m kinda new to coding with php. But what I’m trying to do is have a particular dynamic sidebar active on a particular page only if that sidebar is active. If it’s not active I wish it to load the sidebar that is used on the rest of the site. but I can’t for the life of me figure out how to code it.

I have the following, but it doesn’t seem to be working.

<?php if ( is_page(190) ) { ?>

            <?php if ( !function_exists('dynamic_sidebar') && is_sidebar_active('forum_sidebar') || !dynamic_sidebar('forum_sidebar') ) : ?>

			<?php endif; ?>

    		<?php } else { ?>
			<?php if ( function_exists('dynamic_sidebar') && dynamic_sidebar(1) ) : else : endif; ?>
            <?php } ?>