umn>
                                <p:column styleClass="background-color-grey textCenter" rendered="#{!(sessionController.adminPageAuthorized
								or ((welcomeController.superAdmin || welcomeController.admin || welcomeController.writer || welcomeController.etudiant) and empty contact.login and empty contact.mdp)
								or (sessionController.pageAuthorized and empty contact.login and empty contact.mdp)
								or (sessionController.pageAuthorized and sessionController.currentAuthContact.id==contact.id