bp_get_message_css_class()

	function bp_get_message_css_class() {
		global $messages_template;

		$class = false;

		if ( $messages_template->current_thread % 2 == 1 ) {
			$class .= 'alt';
		}

		/**
		 * Filters the CSS class for the current thread.
		 *
		 * @since BuddyPress 1.2.10
		 *
		 * @param string $class Class string to be added to the list of classes.
		 */
		return apply_filters( 'bp_get_message_css_class', trim( $class ) );
	}