Adding a gallery to your IPB forum can really boost your visitors' inflow. There are several options though. The easiest one that you can implement is to add a Invision Gallery which is developed by IPB's programmers and will not yield any incompatibilities with your forum software and can be easily administered from the admincp of IPB.
Upload invisionboard.inc.php to your bridge dir (if you have installed Coppermine through Fantastico the file will be already there). In order to use the bridge, you should make some changes in the invisionboard.inc.php file and enter IPBs database information: