Dynamic price updater is a module which u can use to update the price on the product info page of the Zen cart. When u select any check-box or select from drop down or input the quantity of the product it dynamically updates the price on the the product info page which is a very useful tool in the zen cart.
It uses the ajax and jscript to update the price dynamically. Click here to download the files

After downloading the file just include the files in your project as they are …

In zen cart that is default that you can create admin coupon to give amount deduction or free shipping ,
you can not give customer both benefit of amount deduction as well as free shipping,
to do that you have to add code in two files that are
1) includes/modules/order_total/ot_coupon.php
2) includes/templates/[your template]/popup_coupon_help/tpl_main_page.php
In file 1 ot_coupon.php
find the code as

if ($od_amount['type'] == ‘S’) $order->info['shipping_cost'] = 0;
$order->info['total'] = $order->info['total'] – $od_amount['total'];
if (DISPLAY_PRICE_WITH_TAX == ‘true’) {
$od_amount['total'] …

To add the banners in the zencart just follow the three steps.
1. Open the zencart database and insert one record in the “Configurations” table.

Keep the configuration_id null(it will update automatically)
Write the title for e.g.’Banner Display Group All pages left‘ in configuration_title.Layout Settings on the Admin side.
In configuration_key write the tag ‘SHOW_BANNERS_GROUP_SET10‘
Note: SET10 is the id of sets of banner. Upto SET9 all are the default banners of zencart.Update the SET no. everytime you want to add banners such as SHOW_BANNERS_GROUP_SET11,SHOW_BANNERS_GROUP_SET12 and so on….
In the configuration_value write any value such as’left_banner2‘
Note …

some has experienced that when clicked on some link blank page is displayed
that problem is there because of add page process of zencart
to add page in zencart we have to create four pages
* A new directory, includes/modules/pages/myNewPage/, containing a file called header_php.php
* A new file in the directory includes/templates/template_default/templates called tpl_myNewPage_default.php
* A new file, includes/extra_datafiles/myNewPage.php, defining your new page’s filename for the Zen Cart™ system
* A new language file, …