function bp_dtheme_ajax_joinleave_group() {
	// Bail if not a POST action
	if ( 'POST' !== strtoupper( $_SERVER['REQUEST_METHOD'] ) )
		return;

	// Cast gid as integer
	$group_id = (int) $_POST['gid'];

	if ( groups_is_user_banned( bp_loggedin_user_id(), $group_id ) )
		return;

	if ( ! $group = groups_get_group( array( 'group_id' => $group_id ) ) )
		return;

	if ( ! groups_is_user_member( bp_loggedin_user_id(), $group->id ) ) {
		if ( 'public' == $group->status ) {
			check_ajax_referer( 'groups_join_group' );

			if ( ! groups_join_group( $group->id ) ) {
				_e( 'Error joining group', 'buddypress' );
			} else {
				echo '<a id="group-' . esc_attr( $group->id ) . '" class="leave-group" rel="leave" title="' . __( 'Leave Group', 'buddypress' ) . '" href="' . wp_nonce_url( bp_get_group_permalink( $group ) . 'leave-group', 'groups_leave_group' ) . '">' . __( 'Leave Group', 'buddypress' ) . '</a>';
			}

		} elseif ( 'private' == $group->status ) {

			// If the user has already been invited, then this is
			// an Accept Invitation button
			if ( groups_check_user_has_invite( bp_loggedin_user_id(), $group->id ) ) {
				check_ajax_referer( 'groups_accept_invite' );

				if ( ! groups_accept_invite( bp_loggedin_user_id(), $group->id ) ) {
					_e( 'Error requesting membership', 'buddypress' );
				} else {
					echo '<a id="group-' . esc_attr( $group->id ) . '" class="leave-group" rel="leave" title="' . __( 'Leave Group', 'buddypress' ) . '" href="' . wp_nonce_url( bp_get_group_permalink( $group ) . 'leave-group', 'groups_leave_group' ) . '">' . __( 'Leave Group', 'buddypress' ) . '</a>';
				}

			// Otherwise, it's a Request Membership button
			} else {
				check_ajax_referer( 'groups_request_membership' );

				if ( ! groups_send_membership_request( bp_loggedin_user_id(), $group->id ) ) {
					_e( 'Error requesting membership', 'buddypress' );
				} else {
					echo '<a id="group-' . esc_attr( $group->id ) . '" class="membership-requested" rel="membership-requested" title="' . __( 'Membership Requested', 'buddypress' ) . '" href="' . bp_get_group_permalink( $group ) . '">' . __( 'Membership Requested', 'buddypress' ) . '</a>';
				}
			}
		}

	} else {
		check_ajax_referer( 'groups_leave_group' );

		if ( ! groups_leave_group( $group->id ) ) {
			_e( 'Error leaving group', 'buddypress' );
		} elseif ( 'public' == $group->status ) {
			echo '<a id="group-' . esc_attr( $group->id ) . '" class="join-group" rel="join" title="' . __( 'Join Group', 'buddypress' ) . '" href="' . wp_nonce_url( bp_get_group_permalink( $group ) . 'join', 'groups_join_group' ) . '">' . __( 'Join Group', 'buddypress' ) . '</a>';
		} elseif ( 'private' == $group->status ) {
			echo '<a id="group-' . esc_attr( $group->id ) . '" class="request-membership" rel="join" title="' . __( 'Request Membership', 'buddypress' ) . '" href="' . wp_nonce_url( bp_get_group_permalink( $group ) . 'request-membership', 'groups_send_membership_request' ) . '">' . __( 'Request Membership', 'buddypress' ) . '</a>';
		}
	}

	exit;
}