`tw_get_testimonial_html_class` hook for alternate css class

tw_get_testimonial_html_class.php

<?php 
add_filter( 'tw_get_testimonial_html_class', 'my_tw_testimonial_html_class', 99, 6 );
function my_tw_testimonial_html_class( $class, $testimonial, $atts, $is_list, $is_first, $widget_number ) {
	static $tw_list_count = 0;
	if( ( $tw_list_count % 2 ) == 0 ) {
		$tw_class = 'tw-even';
	} else {
		$tw_class = 'tw-odd';
	}
	$tw_list_count++;
	$class .= ' ' . $tw_class . ' ';
	
	return $class;
}