found this in another thread
2. in order for the scrolling pix to be fitting in the bestseller box, the following line must be added to catalog/includes/boxes/bestseller2.php.
add: SMALL_IMAGE_WIDTH, SMALL_IMAGE_HEIGHT
just after
$rows = 0;
$info_box_contents = array();
while ($best_sellers = tep_db_fetch_array($bestseller_products_query)) {
$rows++;
$info_box_contents[] = array('align' => 'center',
'text' => '<a href="' . tep_href_link(FILENAME_PRODUCT_INFO, 'products_id=' . $best_sellers["products_id"], 'NONSSL') . '">' . tep_image(DIR_WS_IMAGES . $best_sellers['products_image'], $best_sellers['products_name'],