如何隐藏Magento前端的简单产品？

I am inserting some products in magento programmatically, I want to show just configurable products in front end (Like magento itself) and when user selects "View Details" in details page he can select attributes to select the associated simple product.(I dont want to show associated products in front end) But now both configurable and simple products are available in product list in front end. why it happens?I am inserting some products in magento program