Multisite support

I installed the skipcart module into my default site, and had trouble with the "skipcart yes/no setting" (I don't see the fruit of activating this).

So I tried to install it on a site that I am running Drupal's multisite feature on (domain.org/newsite) that shares the same db, but only shares the user data tables. I ran into the following error, and I am guessing that it is because I had already installed the module on my default site, and the module isn't looking at the db prefix I have in place for my multisite...?

user warning: Table 'skipcart_nodes' already exists query: CREATE TABLE skipcart_nodes ( nid int(10) unsigned NOT NULL default '0', skipcart_enabled tinyint(3) unsigned NOT NULL default '0', skipcart_buytext varchar(255) default NULL ) in /var/www/drupal/includes/database.mysql.inc on line 172.