Show From Multiple Categories

I am using this code to show Posts from the specific category ID = 47 I want to show Post from multiple categories like 47, 45 etc. How..? I try this ‘cat’ => 47,48, but failed. Any other solution..?

<?php
//display 10 posts for category id 47
    $args=array(
      'cat' => 47,
      'post_type' => 'post',
      'post_status' => 'publish',
      'posts_per_page' => 10,
      'caller_get_posts'=> 1
      );
    $my_query = null;
    $my_query = new WP_Query($args);
    if( $my_query->have_posts() ) {
      echo 'List of Posts';
      while ($my_query->have_posts()) : $my_query->the_post(); ?>
      <p><a>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></p>
       <?php
      endwhile;
    }
wp_reset_query();  // Restore global post data stomped by the_post().
?>