fix php script in Magento to only get products from 1 store

We have a php script in our Magento installation that exports a datafeed of products. On our Magento installation, we have 4 separate stores. The script should only get the products from one store, as indicated in the feed. Right now, it gets all products in all stores and does not filter for the store. The feed supplies URLs and image links, which need to have the correct url based on the store. Please only reply if you have worked with Magento previously. This is a very small project and should not take much time for the right person.