Adding products to cart via url in magento

If your Planning to do a website that opens directly on the cart page, in the cart it needs to have some products already selected and it should be ready to go to the checkout page.

Every time the user goes to the page, some products.

<a href="http://example.com/index.php/checkout/cart/add/product/1/form_key/<?php echo Mage::getSingleton('core/session')->getFormKey(); ?>/">My cart</a>