Is there a way to change the "Add to bag" button to something else after the product has been added to the bag? I have already customized the button, but can't figure out how to use a second custom image once the product has been added. (Much like you can change the button image temporarily as the user clicks/unclicks the button – i.e., via css by changing the background image within div.ecwid-AddToBagButton-down).
I have attached a screenshot of how I would ideally style this, but a next best solution would be to add a check mark somewhere close once the product has been added, like the one generated in the Product Browser Widget Code (but I would want add my own custom check mark).
Here's an image what I'm looking to do, or for a live version that adds the product: http://goo.gl/oyXIz

Much thanks if anyone can help me out.