Unfortunately, I no longer have a copy of the plugin! I also don't have use for one, so I'm not going to spend my time re-creating it.
I will, however, show how the rounded corner effect can be achieved using just HTML and CSS.
For modern browsers, just use border-radius in your CSS (and any necessary browser prefixed versions of the property):
For older browsers (IE8 and below), you'll want a group of 4 or more (depending on how rounded you want) HTML elements. A single container element, which holds 2 (or more) radius elements, and one content element. This example uses 6 elements, to provide an illusion of a 4 pixel radius:
You'll want to put all of this into appropriate CSS classes for your use, to make things easier, of course. Hopefully this is enough to get you started (though if my Google Analytics data is correct, you probably don't speak english, so who knows what will get lost in translation).