Some of my products are sold through ejunkie, some are sold strictly through paypal, by-passing ejunkie. Putting up two different "view cart" buttons would be/is confusing.
I use the ejunkie buttons whenever I can (as opposed to paypal buttons that lead to ejunkie) because I like ejunkie's ability to funnel folks to google checkout when they so choose, although I hate Google Checkout, but I digress...
Is there a way to check via php or java script to see if either the paypal or ejunkie carts have contents? If yes, I could programmatically place a "view cart" button on the page when appropriate.