I have a retail site I am working on that needs some cleaning up. Presently, there are radio buttons next to different sizes of the same item. the customer clicks an add to cart button after selecting the size they want. They are able to adjust the qty (in the shopping cart) prior to checking out. They can also click a "continue shopping" button to go back to the product page (to add more to the cart).

It has been brought to my attention that some customers have mentioned they would like to 1) be able to add several different sizes to the cart at once, and 2) be able to adjust the qty before entering the shopping cart.

I know how to do one or the other but how do I combine these features and keep the store looking decent? Any thoughts or examples? this is the page I'm working on right now: http://www.gardensare.com/store/insect-pins.html