Change code to pull from category

[ErikOS]

I have a box and want to change the products displayed in it to display a product from a certain category. I guess each product section must have a unique id

 

ex. rings 1

bracelet 2

 

so when you click on a category it only pull products from that category how do I change this code to do that

 

 

 

$boxContent = '<a href="' . tep_href_link(FILENAME_PRODUCT_INFO, 'products_id=' . $random_product["products_id"]) . '">' . tep_image(DIR_WS_IMAGES . $random_product['products_image'], $random_product['products_name'], SMALL_IMAGE_WIDTH, SMALL_IMAGE_HEIGHT) . '</a><br><a href="' . tep_href_link(FILENAME_PRODUCT_INFO, 'products_id=' . $random_product['products_id']) . '">' . $random_product['products_name'] . '</a><br><s>' . $currencies->display_price($random_product['products_price'], tep_get_tax_rate($random_product['products_tax_class_id'])) . '</s><br><span class="productSpecialPrice">' . $currencies->display_price($random_product['specials_new_products_price'], tep_get_tax_rate($random_product['products_tax_class_id'])) . '</span>';