How do you overthrow the board of directors of a publicly owned bank?

i work at a locally owned bank, not run by stock holders, and a lot of other employees and i are talking about overthrowing the board of directors next year (2008). we know it can be done because it is a publicly owned bank, that is, owned by the customers. we need to know how to go about it the right way so that we are sucessfull. i know that we can get enough people behind us to vote us in but is there any legal issues we have to go through first?