anyone know how to have multiple products per row? help!?

Hi guys, i'm new to this, but i've heard you lot are good at helping with problems like this.
Basically in my products listing page I want three items across, where as at the mo it shows one, even if I remove all the other product info. Here is the example (excuse the blue lines its a work in progress :))
I've seen so many shops displaying multiple products in a row but I can't find any info about customising this bit - please help! Even if you can just point me in the direction of the files that need playing with.
I hope you can help!

You'll need to install the 'Column Layout Grid for Product Listing' mod. Click on 'downloads' at the top of this page. The mod works great.

I just installed this on v1.3.7.1

and got this error message

Fatal error: Call to undefined function zen_get_generated_category_path_rev() in /includes/modules/custom/product_listing.php on line 209

This is line 209:

 $lc_text = '<a href="' . zen_href_link(zen_get_info_page($listing->fields['products_id']), 'cPath=' . (($_GET['manufacturers_id'] > 0 and $_GET['filter_id']) > 0 ?  zen_get_generated_category_path_rev($_GET['filter_id']) : ($_GET['cPath'] > 0 ? zen_get_generated_category_path_rev($_GET['cPath']) : zen_get_generated_category_path_rev($listing->fields['master_categories_id']))) . '&products_id=' . $listing->fields['products_id']) . '">' . zen_image(DIR_WS_IMAGES . $listing->fields['products_image'], $listing->fields['products_name'], IMAGE_PRODUCT_LISTING_WIDTH, IMAGE_PRODUCT_LISTING_HEIGHT, 'class="listingProductImage"') . '</a>';

Any hints on how to correct this?

I just downloaded an earlier version of the product_listing.php file and that fixed it. Yippee!

thanks guys!
I installed the 1.3.6 - 1.3.7 one, and added the SQL patches and hey presto!
i can't believe i didn't ask for help sooner! was going mad scouring the tutorials for something :)