function addUserToTeam(targetUser) {
            var teamUsers = ref.child(targetUser.teamcode).child('users').child(targetUser.userName);
            teamUsers.once("value", function (snapshot) {
                if (snapshot.val() !== null) { //username exists
                    toastr.warning('user exists  - try again');
                    valid = false;
                } else { //username is free
                    if (targetUser.password === targetUser.confirmPass) { //passwords match
                        delete targetUser.confirmPass;
                        targetUser.password = CryptoJS.SHA512(targetUser.password).toString();
                        ref.child(targetUser.teamcode).child('users').child(targetUser.userName).set(targetUser, onComplete);
                    } else { //passwords do not match
                        toastr.warning('Passwords do not match - try again');
                       valid = false;
                    }
                }
                return valid;
            })