...hi, in the sourcecode look for:
SMALL_IMAGE_WIDTH, SMALL_IMAGE_HEIGHT
. These sizes you can change in the admin ->configuration -> images.
If you want to output the large image in the product_info, you have to change:
document.write('<?php //echo '<a href="java script:popupWindow(\\\'' . tep_href_link(FILENAME_POPUP_IMAGE, 'pID=' . $product_info['products_id']) . '\\\')">' . tep_image(DIR_WS_IMAGES . $product_info['products_image'], addslashes($product_info['products_name']), SMALL_IMAGE_WIDTH, SMALL_IMAGE_HEIGHT, 'hspace="5" vspace="5"') . '<br>' . TEXT_CLICK_TO_ENLARGE . '</a>'; ?>');
into
document.write('<?php //echo '<a href="java script:popupWindow(\\\'' . tep_href_link(FILENAME_POPUP_IMAGE, 'pID=' . $product_info['products_id']) . '\\\')">' . tep_image(DIR_WS_IMAGES . $product_info['products_image_lrg'], addslashes($product_info['products_name']), SMALL_IMAGE_WIDTH, SMALL_IMAGE_HEIGHT, 'hspace="5" vspace="5"') . '<br>' . TEXT_CLICK_TO_ENLARGE . '</a>'; ?>');
or without java script:
<?php echo tep_options_images(DIR_WS_IMAGES . $product_info['products_image_lrg'], addslashes($product_info['products_name']), $image_width, $image_height, 'hspace="5" vspace="5"'); ?>
...