Trying to find a app for network printing

Im working for a friend of mine here. We are trying to find a app that I can use to print from iPad, through Bellini USB router, and to the printer.

I got this done for the desktops he has, but he also wants it for the iPad. Is there anyway this can be done?

HP has an ipad app for their wireless printers. It work OK, but could be better.
The app is called HP ePrint.