thank you, Dr. Hill. Thanks also to Dr. Tom Bleck who also provided the article. I'll have to check the website out as well. ck Charles S. Krin, DO FAAFP **************Create a Home Theater Like the Pros. Watch the video on AOL Home. (http://home.aol.com/diy/home-improvement-eric-stromer?video=15&ncid=aolhom00030000000001)