Import/Update Products inside a Magento store

Objective: Update/insert products from a computer (.xls file) inside a running Magento store v1.4.1.1. our client will use an easy webinterface in php/mysql/ajax/javascript to upload his products everyday (first time he will insert around 1000 products and then around 20/30 update/insert product everyday) Our client must only need to generate this [login to view URL] file 1,000+ records everyday (maybe 10 or 15 new insert other will be updated product only if needeed). --------------------------------------------------------- What is important for our client is to have an easy interface to upload the file and images (no ftp, no magento admin... he use facebook and find there interface easy to use) check [login to view URL] --------------------------------------------------------- I require Skype access to the developer. You will find attached a type of file that our client can export is data from his software [login to view URL] and corresponding [login to view URL] in magento.