It would really help if you were to mention which extension you were using. From the context of what you say it sounds like the VM2 Product Snapshot.
There is not much that can be done about this, the continue shopping link is generated by Virtuemart, not the plugin. You could try editing the cart template and put in a link back to the article, the most effective way to do this is to include some simple javascript in the link code:
<a href="#" onclick="window.history.go(-1)">Continue Shopping</a>
That should take you back to the previous page in the browser history.