Notes for shopping cart
Bob, found these notes on the casbdc.org site and posted them here for posterity.
You have to set the target from "paypal" to "_self" or it opens a new window. This in buttons and view cart.
You also have to add this variable in the code by the other hidden input items
<input type="hidden" name="shopping_url" value="http://www.californiasbdc.org/catalog" />
This is the return when you hit continue shopping on the paypal url.