how to get it work with bg gallery

First i would thank the developers for this useful module. Another thank to the community for providing info and solutions to various problems. The biggest problem was firstly with lightbox module that i finally got it working with fck by simply adding few lines in the editor(http://dev.fckeditor.net/ticket/2627). The second problem that can't handle yet is the bg gallery module. Actually i ve tried everything with filters and other solution but yet fck removes the tag bg completely. If somebody has a work arround for the editor i would appreciate the help