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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 given in the folder structure you downloaded the file.