How do you change the cord on a dryer from a four prong cord to a three prong cord?

4 prong to 3 prong adapter - Google Product Search (http://www.google.com/products?oe=UTF-8&sourceid=navclient&gfns=1&q=4+prong+to+3+prong+adapter&um=1&ie=UTF-8&ei=zCHCSoyeMdGAkQWxm6zCBQ&sa=X&oi=product_result_group&ct=title&resnum=4)

:)