function benz_meta_box_markup($object) {
  wp_nonce_field(basename(__FILE__), "meta-box-nonce");
    global $post;
    $benz_tab_count = get_post_meta( $post->ID, '_tab_count', true );
    for ( $x = 0; $x < $benz_tab_count; $x++ ) {
      $y=$x+1;
      $benz_tab_content = get_post_meta( $post->ID, "_tabs_content_$y", true );
      if ( ! $benz_tab_content ) {
        $benz_tab_content = '';
       }
      $settings = array( 'textarea_name' => "benz-product-tabs-details_$y" );
      ?>
      <tr class="form-field">
        <th scope="row" valign="top"><label for="benz-product-tabs-details_<?php echo $y ;?>">Tab <?php echo $y ;?> Content: </label></th>
        <td>
          <?php wp_nonce_field( basename( __FILE__ ), "benz_product_tabs_details_nonce_$y" ); ?>
          <?php wp_editor( wp_kses_post( $benz_tab_content ), 'benz_tab_content', $settings ); ?>
        </td>
      </tr>
    <?php
  } // end for loop
} //custom_meta_box_markup