Decimal Fix for Prices in Japanese Yen (English site)

Simply put, we need to remove the decimals that currently display with prices on our site. We are a small e-commerce site based in Tokyo that sells goods to English-speakers based in Japan. Our site is completely in English, but we sell everything in Japanese Yen. Whereas US dollar prices always display with two decimals, Japanese Yen prices never use decimals. Therefore we need them to be hidden when prices display. For example, a price like'140.00 yen' is incorrect and should be shown as '140 yen'. Our cart and site are hosted Volusion ([login to view URL]), a US-based company that offers integrated shopping cart solutions for small businesses. The site template and coding were done by Volusion. On the whole, their services are amazing, but as they are not used to working with Japan-based clients, their software by default always shows two decimals after prices. I think we basically just need to have a simple Java rewrite thrown into the template header to specify that Yen will not display decimals. As Volusion created all of the main coding, there are certain root files that we do not have access to. Thus, I think a rewrite in the header is the best (if not only) option. If you have specific questions about their software, they have 24 hour chat available on their site and their people tend to be extremely helpful and responsive. Please note that many products' descriptions list product sizes with decimals. Thus, if possible, we need the removal of decimals to be limited to the prices only. We would like to get this taken care of as soon as possible, as I think many people get confused when they look at the site and see the decimals.